Is pedophilia wrong?

Yes, pedophilia is wrong.  Pedophilia is the the sexual actual act or sexual fantasy that an adult has with and/or regarding a child or children.  Such acts are sinful.  First of all, the sexual union is only properly had between a husband and wife.  It is never to be had between anyone else.  Therefore, pedophilia is a sin.

• 1 Cor. 6:9-10, "Or do you not know that the unrighteous shall not inherit the kingdom of God? Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals, ¹⁰ nor thieves, nor the covetous, nor drunkards, nor revilers, nor swindlers, shall inherit the kingdom of God."
• Heb. 13:4, "Let marriage be held in honor among all, and let the marriage bed be undefiled; for fornicators and adulterers God will judge."

Clearly, this sin is forbidden by God since it violates the natural created order of sexual union between a husband and wife.