Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb5e311e1e04b53…

MALICIOUS

PDF

66.4 KB Created: 2021-06-29 23:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0471ce4ee0dd1fd08462403c8e303ee SHA-1: 6878df85d74cf8b33c36dddc35488ada4b9f2824 SHA-256: 5fb5e311e1e04b53b5d32e442aab78ea2d2f654f8a08d55126fa12a001383e1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6756

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=white+long+haired+chihuahua PDF link annotation
    • http://amdind.com/userfiles/file/20191579634.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/tigikopuwosawukijajo.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/11256656943.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/rukozife.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97dfea851---lekudopelegoloxogeli.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9018032e3---vidusidelidalitolo.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/pijovegigolimefirad.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/505da8aa6409694c707f755caa8dfb3d/12412687275.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/witonutipala.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/mezefudisevovumipumufu.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/e68f6e2f7286348bb1d56653b3901570/kujogogadenira.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/mawefobuxivalazijuke.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/kezaxiworozirikun.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160928ac411761---60796446928.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092332361a97---87523053554.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/6a90c100f0c68bbc7308f334c8b3e4c5/45846170483.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/81321085625.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/ninotaxademakukumow.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/94623824999.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f1f2e4147---93291017355.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/5e6319de2b16601c9800774210f717f7/5426929824.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/nanexujezasim.pdfIn PDF document text

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