Brazil’s Leal Hidalgo Yoandy topscored the match with 20 points in Gliwice, Poland.
Milad Ebadipour, Amirhossein Esfandiar and Mohammadjavad Manavinezhad collected eight points each for Iran.
Iran started the competition with a 3-2 win over the Netherlands and then defeated Egypt 3-1.
Team Melli lost to the Netherlands 3-1 in the Preliminary round and also was swept by Brazil 3-0 in Round of 16.
Brazil will play Argentina on Friday in the quarterfinals round.
Quarterfinals Fixture:
September 7:
Slovenia v Ukraine
Italy v France
September 8:
Brazil v Argentina
Poland v US