Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75af13759431aec…

MALICIOUS

PDF

66.8 KB Created: 2021-05-02 20:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92eab0cdab4abad837c3e2d707a0a66e SHA-1: d7c03a5385623642cf5d835cda65220a50624f74 SHA-256: d75af13759431aec29d3bedee89b061ad0b8a10ff21c287a01d906d389ba5be0
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a common phishing or malware delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9547

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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a86f0673449aa157019193e62bbe833f/2996935253.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba21fd9ef0---69214888121.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070422e5c814---nitoluzaxokajiwew.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8dfea3033---75631783686.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ain5ajbou5fddib2uk9khupal7/xorojowova.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c8ed11323c69ed8759df2bac4bd97b44/dabobuputavi.pdf
    • http://aimic.com/userfiles/file/ruzari.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2c779b5fd7222769de680c76fae424d9/retipiriromojusi.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/5pbjkstkedjj6t1lpv54kg38ht/32834132457.pdf
    • http://curry-box-deluxe.de/userfiles/file/51607519746.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca8648132---50176876502.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c2e8e7c4---xozolepo.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a07a7e0cdf448ce153211f304758ccb7/nuzodugerifitufetudoku.pdf
    • http://ajivikafinance.com/userfiles/file/xudepixasik.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/91313288b3d567a33f877a17433a972e/nagojinorowifofigibuze.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160737e346d0b9---79439588518.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=autodesk++manager+network+error
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1c.bin
5dd682fc4d83f487aad2909981a3b0774dab753df6828a0f50f28a9a0d43b511		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 3568 bytes
font_01_sfnt_off0000d8da.bin
fb18a4a97f50d115a402d4245aa09aa9d7454cb340b284810a1e33a3af7851fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 5260 bytes
font_02_sfnt_off0000eab5.bin
be87486d6a57dbd05ef408c1c8cca2e4c21d197d42e1b94f61a43e0c6df0a2d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 11372 bytes

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