"Wild wolves are naturally aggressive but are generally cautious enough to occasionally appear timid around humans. Wolves usually try to avoid contact with people, to the point of even abandoning their kills when an approaching human is detected, but there are several reported circumstances in which wolves have been recorded to act aggressively toward humans.
Compared to other carnivorous mammals known to attack humans in general, the frequency with which wolves have been recorded to kill or prey on people is much lower, indicating that though potentially dangerous, wolves are among the least threatening for their size and predatory potential.[1]
"
Source
http://www.aws.vcn.com/wolf_attacks_on_humans.html
Wolf Attacks appear to be much more common in India / other areas of Asia, interesting