KDA Group Inc., formerly Ketchum Directory Advertising, has filed for chapter 11 protection, the Pittsburgh Post-Gazette reported on Saturday. A filing in the U.S. Bankruptcy Court in Pittsburgh said the firm’s liabilities total between $10 million and $50 million and it has assets of less than $500,000. Last year, the business was acquired by YPM Inc. of Irvine, Calif. YPM declined to comment. Ketchum Directory at one time was part of Pittsburgh-based Ketchum Communications, which was sold in 1996 to Omnicon Group of New York.