All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Movies usually contain a lot of evil, and the advertisements that promote them are in fact a means of aid to vice. Therefore, it is not permissible to upload these advertisements or the movies themselves, whether the purpose of the upload is to watch them or to publish them. The fact that the owners of these movies are sinful, does not negate the sin and responsibility of those who watch them or participate in publishing them.
Allah knows best.