The company has signed a framework agreement that outlines plans for new gas pipelines and thermoelectric power plants in the southern state of Paraná.
The deal with a group led by the International Finance Corporation will see Frontera pay US$225mn in cash over a 36-month period, plus accrued interest.
The order extends to former Petrobras CEO José Sérgio Gabrielli, ex-finance minister Antonio Palocci and three of the energy firm's directors.
The Brazilian energy giant's shareholders approved the sale of two subsidiaries to units of Mexican group Alpek earlier this year, but antitrust authority Cade is looking into the deal.
The World Bank affiliate is expected to approve the operation during a meeting of its board on December 7, according to documents published on the lender's website.