Unless UTG sat and posted then he's played at least one orbit. By "just sat...no reads" do you mean that he didn't play any hands his first orbit, blinds included? If that's the case then you can assume he's tight until proven otherwise, which means that you're up against a strong range.

Pre: What's your table image? With that many callers on a squeeze I'm wondering if you've been playing loosely. I'd make it more like $1.20 to $1.30.

Flop: If my image was tightish then I woulda c-bet to about $2.25 because by checking behind you kinda turn your hand face up.