Yes its random.
Thousands of poker players have data bases with thouands of hands. Hands hold up as often as they should and lose about as often as they should. If online poker was rigged or the deal wasnt kosher and people hit there two outers more then they should, it would be public knowlege.

The thing is poker sites want the game kosher, they make money, alot of money and there is no reason to screw with that. Infact its worth it to them to spend millions on fraud provention to make sure the game isnt spoiled.