Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f464fda56740d6…

MALICIOUS

PDF

66.5 KB Created: 2021-07-16 10:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0ab5f54d63b724e0fd06652f9ce3f3d5 SHA-1: 71b0c1c2ec0d8de30883af12e38fcc5274bdb55d SHA-256: 26f464fda56740d62f0e13dd1361f3ea45df321363f36ff8b8553a60f9a921ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host malicious content or redirect users to phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5460

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://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/k1huf42rm8c11t26c8n7i0t1aj/83452714522.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/c1i3uq64imcd9rn1uraa3aobjf/kigiwuzezuxosafulezup.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3ulma5osmcfrqrn8oacdqukgbf/manatopudigejojafitezot.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/7443858717.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/eae8c6eecd2902e066f1be505e00d0e5/55648684737.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/wawid.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/00eb8rov01hoatnsdmci4fdkcp/77472247240.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/nurejuvegedimipoled.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/87398475113.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/8950897102.pdfIn PDF document text
    • https://actor-conseil.com/files/file/pebufutavalikosogexoti.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609436d7dd5b7---92993481511.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/52903533914.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/97168576107.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/0ecedce41835de1155bb77623cb8ffb7/kagosikutumenoveloxulibu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57b4ca0ce---vowokipok.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/zepetedalunoburezud.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/47634924132.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb66cdd42---75261418369.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820580505b1---rofolutajitidosanajegob.pdfIn PDF document text
    • https://alutat.com/data/file/59830613068.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2623d701---68162792037.pdfIn PDF document text
    • http://haki.vn/uploads/files/95098296713.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf43ceec8---83983915153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cost+of+acquisition+in+case+of+inherited+propertyPDF link annotation

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