Uber on Saturday directed questions about the case to the police.
The company said in a 2017 blog post that it had received reports “from cities across the country about rideshare scams.”
“Unauthorized individuals may pose as rideshare drivers and target people who appear to be distracted or impaired,” the company said at the time, when it started a public safety campaign directing passengers to check that the driver and car matched the information on their apps.
Ms. Josephson’s disappearance and the discovery of her body drew national attention, including from the University of South Carolina, where she was a student.
“Our prayers are with the family and friends of Samantha Josephson following the devastating news of her death,” Harris Pastides, the president of the university, said in a statement. “Times like these leave me searching for words of wisdom and comfort.”
The Township of Robbinsville, N.J., where Ms. Josephson’s family lives, said in a Facebook post on Saturday that its “thoughts, prayers, boundless grief and endless support” were with them.