Cannibal Holocaust was banned in several countries, including Italy, Australia, the US, Norway, Singapore, and Finland, and though the ban has been lifted in some countries, it continues in many others.
Cannibal Holocaust is one of the goriest movies ever made and even includes real animal deaths on screen, leading to its ban in Italy for violating animal cruelty laws. Cannibal Holocaust also received a five-year ban in America for animal cruelty and extreme violence.
Therefore, it is not possible to directly install an APK file on an iPhone. If you want to run Android apps on your iPhone, you can use an iOS emulator, such as Cider or iAndroid, which allows you to run Android apps on your iPhone.