Reading http://news.softpedia.com/news/Iranians-Capture-US-Drone-wit... it sounds more like the attack was on the drone itself which manifests itself if the drone loses GPS lock. Perhaps a secondary navigation system that can more easily be spoofed?

Also, this article in New Scientist http://www.newscientist.com/blogs/onepercent/2011/12/did-ira... says that the drone was damaged on landing, hence the drapes around the bottom of the aircraft in the picture.

The (alleged) story is that Iran spoofed the GPS signal to make the drone believe it was approaching its friendly landing strip, when in fact it was approaching an iranian field of the same orientation/altitude...

The wings appeared to be held on by duct tape. Perhaps it didn't fall from very high.

This is being downvoted, but I am serious. In the pictures you can see the wings have been crudely reattached to the body using a white tape to cover up the supposed break. Hence it seems possible that the plane crashed, but not from an altitude that would do major damage.