It happened on June 27 at 3 a.m. in the 1600 block of Cecil B. Moore Avenue.
Surveillance video shows three teens approaching the 23-year-old victim from behind and knocking him to the ground.
They then kick and stomp him repeatedly in the head and torso before going through his pockets.
They fled north on 17th Street with the victim's wallet and cell phone.
Police tell Action News the victim suffered a broken jaw and head injuries.
Investigators have released the following description of the suspects:
Suspect#1: Black male, 16-19 years of age, thin build, short hair, wearing a light blue #21 Tomlinson San Diego Chargers jersey, blue jeans and white sneakers.
Suspect #2: Black male, 16-19 years of age, wearing a striped shirt, light-colored shorts and dark colored sneakers.
Suspect #3: Black male, 16-19 years of age, medium complexion, thin build, short hair, wearing a white T-shirt and blue jeans.
Anyone with information about this crime or these suspects is asked to contact Det. Gallagher, Philadelphia Police Central Detective Division, at 215-686-3093/3094.