Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d057bcf911cfbd…

MALICIOUS

PDF

72.5 KB Created: 2021-06-11 08:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ef1a5929d814be49a6ac58a3a2209eb SHA-1: d8dcec10ef746c009d04a79bc6a79af028292416 SHA-256: 20d057bcf911cfbd5e8f770a90125189240917f08643be538e85e932d1bf9826
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download potentially malicious files disguised as software. The presence of multiple URLs hosted on compromised WordPress sites and disposable domains suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8197

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://cructi.ru/uplcv?utm_term=download+bus+driver+simulator+2019
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/dn178t6r5bt827i7q9p2sul9f3/62688229419.pdf
    • http://world-green-hope.com/uploads/files/18008735413.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5ad48a638---91329774899.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce7321cf13---7386283418.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160882eace3a42---52324764750.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3c7efd62---kuvolajavovijumoroxo.pdf
    • https://bedandbreakfastchia.it/userfiles/file/buxivap.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/21b7b13f4894403f537ae2f31bad3d96/39604451028.pdf
    • http://edu-family72.ru/content/images/uploads/file/nibeforuvefomagajosip.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ccd19a38---91710306275.pdf
    • https://caribemed.com/userfiles/file/46387556657.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5jmodqlig3o6eaomkf8ir0qm0j/nejinukafa.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/pqfk3k38g0ajl3dkalehur8327/razadipigadegobikejipiwo.pdf
    • http://lubrifianti-auto.ro/files/file/8163234979.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3506bd25d---sizidewoguwawej.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0f033d995---76890921730.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23f.bin
a46d699a1d46068d01715dabfef9dc24f936a1fd8164ff2ee258ae317b7536ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 5744 bytes

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