Working remote in Brazil

I will be flying to Brazil for a month and living with my Brazilian wife. I am a US citizen and we will register our marriage there. I plan to work while I am there from my US company which I do computer IT stuff. Is there anything I need to know from the legal side of things like if I am asked if I am there for work or leisure? Do I need to pay Brazilian taxes or have a form with me? I am inclined to just not say anything but from a company liability perspective I need to do the correct paperwork.

I think you will be fine.  I would say what you wrote and maybe showing proof of marriage and wanting to register marriage in Brazil is a correct answer! They may even offer advice for such.
Would not volunteer working. but it is not illegal to do your work in Brazil on line. If asked just say, "if needed I will do work if US company needs you."

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