The head of Hillary Clinton's presidential campaign is linked to a Russian bank involved with an emerging international scandal, according to documents reported on Tuesday.

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Registration forms indicate that the Podesta Group signed up to lobby for the Sberbank of Russia in Washington about a month ago, in early March. The bank has been implicated in a scheme unearthed on Sunday in which leaders worldwide illegally stashed their assets overseas.

The Podesta Group was founded by John Podesta, the chairman of Clinton's 2016 campaign for president and a chief of staff to former president Bill Clinton. His brother, Anthony Podesta, is listed as a lobbyist for the account on the March filing.

The form, which was first discovered by the Washington Free Beacon, also lists three affiliated companies. Those include the Luxembourg-based SB International, Cyprus-based SBGB and Troika Dialogue Group, located in the Cayman Islands.

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The Organized Crime and Corruption Reporting Project, the collection of journalists responsible for initially reporting on the papers, have indicated that Troika Dialogue and Sberbank are tied to Russian President Vladimir Putin and his associates. Troika reportedly signed away assets to another company, Avto Holdings, owned by Sergei Roldugin, a godfather to Putin's daughter.

The Panama Papers, comprised of 11.5 million pages leaked from Panamanian law firm Mossack Fonseca, were first revealed on Sunday.