Andreas Hvid is being investigated by Egyptian authorities for violating public morality in the Islamic country.
But questions have been raised over the image he posted online after critics pointed out it looks too bright to have been taken at night.
The video, shot by Hvid before the stunt on top of the World Wonder, shows him and a female accomplice climbing up the side of the pyramid in darkness.
But the image taken at the top, which seems to show them locked in a naked embrace, is much brighter.
Secretary General of Egypt's supreme antiquities council, Mostafa Waziri, said: “The public prosecution is investigating the incident of the Danish photographer and the authenticity of the photos and video of him climbing the pyramid.”
The footage – which has since been deleted – shows the lensman and the unnamed woman reaching the 455ft top and looking out over the view of Cairo below.
An explicit still picture which is inserted into the video then shows Hvid on top of the woman, who is lying on the summit of the 4,500-year-old pyramid.
State news agency Ahram Online has since revealed the minister of antiquities Khaled el-Anany had referred the case to the prosecutor general for investigation.
He said the action was a violation of public morality and the incident and video would be investigated at the highest level.
Just climbing the pyramids beyond a certain level is forbidden and the whole site is out of bounds after 5pm, after which it is patrolled by cops.
Egypt, a mostly Muslim country, regards the pyramids as among its most important monuments.
Egypt Today says he wrote in the description for the video: "In late November 2018, a friend and I climbed the Great Pyramid of Giza.
"Fearing to be spotted by the many guards, I did not film the several hours of sneaking around at the Giza Plateau, which lead up to the climb."
The pictures and video are said to have been shared hundreds of times on social media, sparking an angry reaction from many of those who commented.
One of the latest posters, Martin Eiler, who commented on Facebook after the image had been removed from that site, said: "Andreas; think about and remove your pyramid (picture) from your website. It's not legal, but what's worse is that it's not okay at all…"
Another added: "In my opinion, the nude stuff is very disrespectful and ignorant."
"Total disgrace. Total disrespect for local culture," was the view of another poster.
Earlier this year, we told how a model who stripped naked at Karnak Temple in Luxor was thrown into jail.
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