Malicious PDF — malware analysis report

Static analysis result for SHA-256 93801f4af6da7b9c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 09:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff86cf4954e7c27a3fe5ff15822298bb SHA-1: 9ba965d031cf14e3dad3326476dea6e97a331867 SHA-256: 93801f4af6da7b9ce9369c138e649a8a51fd45a61664c16d479da7a7b1ff8145
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7671

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.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a407a0c641f---6602771154.pdf In PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/wawam.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/mowudegobatusazap.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/16594876557.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/todasoz.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/33030141181.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b405bc6676a---mebob.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9iu0s39rcah5aiqn4h4b42o1p3/235258481.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/bilugekokijipemomuralega.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/zevunatifeluja.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suwojuwuwodat.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/rarakufu.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/pomuvonakitutakenenipibi.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/divifidomexaponolonoli.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210705113401_1750977392.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4223e979b3cbdc5613af0ac1859b8702/63714936454.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/25175365617.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/bunozosun.pdfIn PDF document text
    • http://xsteelstock.com/d/files/xeloxazuduvuz.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/85121742261.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/c2de4ed92d31bdfaa67f3f2d1196dd44/tigewute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=midas+touch+by+kenneth+hagin+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 18652 bytes
SHA-256: 855598ef1b744a55168bd6c3e3b0aec4456d8b2d1b49e7903d1da7c6f34a0d11

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