Plagiarism is a severe problem for higher educational institutions today. A substantial effort must be made to prevent students from committing plagiarism. This study investigated EFL students perceive of plagiarism and the type of plagiarism students committed when writing an academic paper. It applied the qualitative method with a case study involving a questionnaire, interview, and document analysis to collect the data. The participants were purposively invited; 50 students who attended online academic writing courses. The findings demonstrate that students can define plagiarism simply and believe it to be a negative behavior. However, plagiarism was still practiced by students, either intentionally or unintentionally. Furthermore, the result of document analysis reveals that eight types of plagiarism are detected in the students’ academic writing works: retweet, “find and replace”, clone, aggregator, ctrl+c, 404 error, hybrid, and remix.