The image below, found in Was this the first-ever photo of a full moon very close to lunar new year? (and used here also) where it was credited to New photo of Lunar farside and Earth was taken by the microsatellite Longjiang-2 which accompanied Chang'e 4 lunar lander the Yutu-2 lunar rover. The signal was received by the Dwingeloo radio telescope but not really "hijacked".
There are many photos of the far side of the Moon, most reconstructed from many survey images, though this one is actually only a small part of the Moon taken from low lunar orbit.
Are photos from the Longjiang microsatellites the first unstitched single frame images to show substantial detail of almost all of the far side of the Moon?
note: "almost all" because you have to be at infinity to see an entire hemisphere, and "substantial" because images of the Earth-Moon system from deep space lack substantial detail.