Malicious PDF — malware analysis report

Static analysis result for SHA-256 5214bbb718f66a72…

MALICIOUS

PDF

72.0 KB Created: 2021-06-17 07:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5f1ebeca1b23c0e17fce0f6f6ddfcf6c SHA-1: fc4f07f5b2c49c478eb61c33ca34464da0916a52 SHA-256: 5214bbb718f66a722a9b37d1ab1342287650843d6d8c41762c218f77c4a8218e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. The presence of multiple distinct hosts and UTM parameters indicates an effort to obscure the final destination and potentially track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9098

Heuristics 4

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. 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://irlanc.ru/uplcv?utm_term=%25D0%25BF%25D0%25B5%25D1%2582%25D0%25BB%25D1%258E%25D1%2580%25D0%25B0+%25D0%25B2%25D1%2581%25D0%25B5+%25D0%25BF%25D0%25B5%25D1%2581%25D0%25BD%25D0%25B8+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25B1%25D0%25B5%25D1%2581%25D0%25BF%25D0%25BB%25D0%25B0%25D1%2582%25D0%25BD%25D0%25BE PDF link annotation
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9f5578e4---57481173796.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a9cb3104---66756422251.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5313924d2f6d4eec56e40b9446ad6b72/povubokufolubuje.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c766099f5e---kamonifejalapanu.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/74882035604.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c36892f13a---zuxabavefep.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/12886790591.pdfIn PDF document text
    • https://micsys.in/userfiles/file/dilinugowodilep.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/60471776757.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a3e4a329---33249506296.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3dbe1426---kepekepifiko.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/petunaxiwamod.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3305cd17---rodametag.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c24b80032c9---parirevimafovibi.pdfIn PDF document text
    • https://retta-bg.com/userfiles/fovuxaluwab.pdfIn PDF document text

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