It is! It's a real phenomenon where someone or something freezes so fast that it will stay in place even though it's meant to fall, for example, some deer get their antlers stuck and then freeze standing up.
Wrong this is the image of a dead soviet soldier during the winter war. You got the war and nationality wrong. You can search up dead soviet soldier proped up by Finnish soldiers on google. Articles explain it.
Not sure I believe this one or not it is possible I guess .
It would be more believable if the snow was deeper keeping his knees from buckling. Lots of weird things happened in WW II LIKE A BOMBER B 17 plane landing itself at an airfield with out a crew on board
https://m.youtube.com/watch?v=EN-2He70Aek
This photo of a dead German soldier was taken sometime during operation "Barbarossa" the soldier was frozen mid-fall after being shot this photo show how fast and how deadly the Russian winter can be.