Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd65755f6411d7d…

MALICIOUS

PDF

48.0 KB Created: 2021-09-08 07:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a1718b64b662ae663f23874ad2156fa5 SHA-1: 5dc720e33054e3254cd35c0752bfeb7c7b5ef3b2 SHA-256: cfd65755f6411d7d0c227e91c70d787c76dd131176f8fca15d53290d635a65dc
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains multiple links pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. The ML classifier flagged this PDF as malicious, and the presence of external URI heuristics further supports its suspicious nature. The primary attack pattern involves directing users to download malicious files from these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5968

Heuristics 3

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tepihtrava.rs//files/sifamerasum.pdf In PDF document text
    • http://slp70.com/clients/873855/File/tivuvesasajariramewilimuj.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63951e735---juxisugonetumebidur.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/poveduve.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba069004e---47852364339.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/44783936859.pdfIn PDF document text
    • https://fototipia.hu/files/files/97419648554.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e43da01761---sumugakivitesekobuniwobi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612c16963503e---subid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=prism+and+pyramid+questions+pdfPDF link annotation

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