brandalism

noun2

1. •
   The deliberate defacement of corporate iconography, generally for purposes of protest, parody, or social commentary.
2. •
   The encroachment of ads, logos, and other types of corporate branding into public and traditionally non-commercial spaces, or the dissemination of corporate messages through methods or mediums not typically used for marketing purposes.

   • But in what archaeologists describe as one of the most shameful instances of 'brandalism' seen in Britain, Channel 4 executives stand accused of defiling the oldest hill-chalk carving in Britain. — 2003