Clearly, it appears to be a tall man with dark hair wearing jeans with a light shirt and a dark jacket. Disturbingly, the lower left leg and shoe of this supposed apparition seems to be almost in focus and not transparent. In fact, both legs of this "apparition" appear to cast shadows forward as do the others in the shot. Interestingly, he or it, also appears to be posing with the four other people.
To be honest, this apparition looks too good to be true, which begs the question as the conditions of the shot as well as to who was taking the photo and did they see anything out of the ordinary. Also, was there, in reality, a fifth member of the group who was actually posing with them at the time. This photo requires far more hands on work to make any sort of determination as to its validity.