A corporation is a collection of people. If these people are doing immoral actions, so is the corporation. Everything that happens by human action is moral or immoral.
I don’t think you can.
If you know of one, can you link a proof?
I'll do it differently. A State is a collection of many people, and a lot of States do evil things. The dictatorships in the Middle East, for example, and there is another example I won't include, but you can guess. Do you not see those organizations (because States are organizations at the end of the day), as evil? If corporations in those countries help those regimes, do you think those corporations are still amoral?