It looks like a steel frame to me. Most dropouts on steel frames are forged or stamped from mild steel so they can tolerate rebending from accidents like this. The traditional tool to re-align the hanger is the Campagnolo "R" tool:
It threads into the hanger and the arm is used to bend the hanger back into alignment so it lies equidistant from the rim all along the rim circumference.
If this is an indexed shifting system, these are much more fussy than friction systems and a more precise tool is often needed, but the principle is the same: