Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ebbab62a70f0db…

MALICIOUS

PDF

78.8 KB Created: 2021-06-11 20:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3501502162e6edabdc321e6c9c5059db SHA-1: 84e8871e7584c71b17146385ffd522dd2ca6df79 SHA-256: 57ebbab62a70f0db3f75137b6b37c4a3835c291e7ca7107844659cc6e4043ed4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links pointing to compromised WordPress sites, suggesting it is part of a phishing campaign to trick users into downloading malware disguised as a WhatsApp update. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the embedded URLs and link farm structure are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7074

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://chcial.ru/uplcv?utm_term=yowhatsapp+versi+8.45
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05fa7b2934---16509701939.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b63f15ac0d7---47106169297.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0eb19176---suzidewiwug.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/addmjdikvsnmcoik22jmm14kqb/76542780214.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6vu4pvq6lt0r2jjbgt1it91f6j/68264286832.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c086c7df602---fisovepetomiwizan.pdf
    • http://asea-admin.com/_userfiles/file/20210514083641.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/32db9fd8a2b1654cb708f978a9420c3d/16187910189.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4257a1dfb9---toturefenanenuje.pdf
    • http://szao-spb.ru/images/news/file/30446797679.pdf
    • https://medtek.vn/storage/file/83833187042.pdf
    • http://bjeclinic.com/ckfinder/userfiles/files/vofavixubemul.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a48c8697ad6---jadukezarufodore.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7affd703b---lifod.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb966294a---xoxasunobe.pdf
    • https://alixdemassy.fr/userfiles/file/xojunojadomelidaxatud.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cbf576120---36892120667.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/63177989409.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014a.bin
33921b5c9d07de100203e1e0835c412b41ac695b7c64024843202734faf65af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 5424 bytes
font_01_sfnt_off000113e2.bin
8ce3adf873191b64ba1b11017bb31d66443ff4395de7169c80e17e2f066a3cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 11200 bytes

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