What penalties are envisioned for offences related to unlawful conduct of campaign financing?

Código Eleitoral Lei n.4737, 15 july 1965 as amended by Lei n? 8.868/94 and  Lei n? 9.504/1997

See articles 289-353.

http://www.tse.jus.br/legislacao/codigo-eleitoral/codigo-eleitoral-1/codigo-eleitoral-lei-nb0-4.737-de-15-de-julho-de-1965#2