Malicious PDF — malware analysis report

Static analysis result for SHA-256 041c90052d04c937…

MALICIOUS

PDF

64.0 KB Created: 2021-09-18 15:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 97aa4d6548f8d8e810a1d6162379f3ab SHA-1: bb4fefef27b09e763b59a68dab73b4d405cdb3d2 SHA-256: 041c90052d04c937c7168c8002feb999825ec6a83f58a2f076804e8427a24c3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing to multiple websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8981

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 http://oreade-breche.fr/userfiles/file/25470122379.pdf In PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/jikowemivorefuguta.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c98ce247f---10004163101.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/robevokukodusukog.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/muwubekaga.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/63467103449.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/152890bb4fc893beb4ae1b42f1c1fb71/dufarijisowazuzaxelitiw.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/tezuganojifoje.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/34112499486.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/14969904905.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1614105b5ca959---82160575226.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/foreze.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/joxovuxelefalovezulur.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137477520f86---50344974671.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/masezamajavomefaw.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/10614489614.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/75373590521.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c29a75fc5735edd8476994bfeb9f0e34/38555351937.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/26711764503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=low+blood+pressure+vertigoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33B 17444 bytes
SHA-256: b7ecf3e4a2933d9f280a41f578bc76ab430f8ceb240a3cb628d9cf60b0aa758c

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