Malicious PDF — malware analysis report

Static analysis result for SHA-256 023d889b20962c1f…

MALICIOUS

PDF

42.1 KB Created: 2021-05-23 16:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: db5525221d6bcd88157b884eaad42b39 SHA-1: 8f2e0931d7ccd37aba12b465510c3b7e79cf649d SHA-256: 023d889b20962c1fc64a3a9ac50381d1e5d9c84c938b80937d8a9d254b2be484
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8033

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=how+to+open+a+digital+sentry+safe+without+the+combination PDF link annotation
    • http://lucann.com/Upload/file/40743460156.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/76417346914.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d53dc9af---33734695547.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e057f0366---leluxolomijixodogek.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/49430541649.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa08eb8f2---jubokuta.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/62782f3k1qll6ig5aoff438jr6/49674852847.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tul4ap3rob3u8r17f8342t6k96/wawuravogazenop.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b59a22be1a---4577498051.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/87744803939.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/20f17685e1c82b5d96c24108288b2d0e/60601420376.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/8772832267.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e46fec8c07---xenupes.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/a7v4c9pbd0b2seifkboqjbj601/wamenisume.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/89fa99bb51f459d9afcd9dcc582eec69/kujisumifipozowu.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/pebekifekomuvujuwem.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d630a1dc7415601814226b87a0c09eff/bunerojepebovanoxezizu.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/66272b8ea5391b4d93242e216b6ccf57/95368350992.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde1a60f75---45129820972.pdfIn PDF document text

Related samples 8

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