Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87289688a44a30f…

MALICIOUS

PDF

79.7 KB Created: 2021-06-07 09:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04b82feae560f072b34df0666b948d9e SHA-1: 35eadd920e17fd7729df2bdcae1c0a4cfed0b53f SHA-256: b87289688a44a30f991ec9f5f93dcf84a4c314b4a264d52527aca89e594298fa
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to '3 phase transformer core size calculation' and 'wkhtmltopdf', likely as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9549

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://irlanc.ru/uplcv?utm_term=3+phase+transformer+core+size+calculation
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8ca26a42---kisarixewujoxile.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ba14aa370d2aaac7707a916033b8ab68/ruwetimonupawubof.pdf
    • http://artospace.com/pics/file/fevexamituxakubiziz.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/27676000224.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/971495d083ee06774fc9aa2e21016291/60960348104.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f9f010c74a50a5e91886081067560e61/82419424746.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/pizowerifile.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/977b86v3bnn8k2hcfo9qsbrd2g/54437288222.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdfe568127---97237672738.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d12f9adb08---vipuzonubegamowime.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce15945dfb---jagolelefejofaxiwebopixex.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/fge7gnqj7fjmvsv914msnfmb5a/katop.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140b206650---9245492168.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9aaba5d32---39452754018.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39cd7721c---75967408222.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/24862147109.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/kowubitapiwonugup.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_off00011368.bin
59120607e6851cb0d8de8d302d7de830a562a0bf8470bd0a48ca7f7b26fc9197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 5376 bytes

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