Though endlessly entertaining and fascinating as it is to look through this story and the comments, sadly, it has all the earmarks of an urban legend. Learn these earmarks and you too can vet a story before forwarding it as an urgent email to everyone you care about. Let's look at it in detail.
1) The Yeshiva News starts and ends by calling it a "bizarre" story and one that they cannot verify. HUGE RED LETTERS.
2) There are very specific details in the story, but no specific sources, nor even indication of sources that wish to remain anonymous.
3) The story is clearly trying to persuade us to a particular viewpoint, namely, that the dybbuk possession is real. A real news story usually at least pretends to be objective about presenting the facts of the story.
4) This story relies partially on "appeal to authority". Were they writing this as a report, they would doubtlessly have gone to those authorities or their spokesman. Then we would have an official statement and possibly clear statements on other issues around the main issue. Given the stature of the authorities, this story would not be hard to verify, were it real. This is similar to "Microsoft says its a very dangerous virus" or "snopes says it is real", and such in urban legend circulation.
5) The story does not even name the synagogue, anyone involved, or even the city. I would think that "who, what, when, where", the basics of a news report, might be in the story somewhere, or at least the claim that someone demanded that they be withheld. This is just a silly story somewhere in Brazil, about some shul, where something happened, possibly regarding someone yelling insane things at the kehila. Some Rabanim are referenced, but we do not have any statement from them or their spokesmen, nor any claim that they declined to comment or couldn't be reached for comment.
As fabulous as it would be to poke endless fun at this story and the flaky fundies who would support the truth of the story based on the fact that "we do not know everything", as terrific a proof as that is, we'll have to heap it in with the myriads of other urban legends and not give it any heed. However, a You Tube spoof of Israeli psychic (oh sorry, it seems in Israel they call them "mekubal") Rabbi Batzri doing a song and dance seance would definitely be appropriate.