I understand that there are prayers that only exorcists can pray but is it possible that a prayer posted online can attract demons? Even if the wording sound like something would pray. Or are there only certain formal prayers that are safe? What if you write your own prayers?
I think if you look at the wording of a prayer and it is legit, then you wouldn't have to worry about it. Steer clear of anything that doesn't sound right. You may 'feel' that something isn't right about it (being in a state of grace of course) and therefore, reject it. And it is wholesome I believe to make your own prayer to God, in fact, one could have a running conversation with Him throughout the day. That is prayer also.