Preflop
I am ok with calling here given the price.
Flop
As others have said, just fold. When UTG is already all in, it is pretty unlikely, that SB is bluffing into a dry side pot. He still need to beat UTG at showdown, so getting you out of the pot has little value for him. Also you get to see his hand, so you get free information.
The issue with continuing here is, that even when you improve, you still have no idea, where you are. You either have a very bad flush or top pair with a bad kicker on a monotone board. If it was heads up, its a different story, but you cant really make a play here, because you also need to beat UTG at showdown to win the main pot.
Turn
As played you kind of have to call on the turn, but it sucks, and this is why, you should just have folded on the flop.
River
A clear check back. If he had bet again, you should have folded.
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