Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b256c7dc1941f45…

MALICIOUS

PDF

47.7 KB Created: 2021-06-24 12:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdb9f43b163dd190f9c94aca8ea35311 SHA-1: 66f1374d770ba9e106190f7c62df52c105981f64 SHA-256: 2b256c7dc1941f459b98ac61d12fed2b2f25c080c908e5954eb5041cc22a769d
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or attempts to trick the user. The file functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as a distribution point for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7989

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://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a487e703---69446373034.pdf
    • http://allprintusa.com/admin/images/file/nuvabisipum.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f477fecf98---86085084209.pdf
    • http://distributoram.com/files/file/86649684046.pdf
    • https://agentcctv.com/userfiles/file/lobopi.pdf
    • https://psfund.org/public/uploads/files/cms_files/43033656098.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f0b562a61---63846365754.pdf
    • http://musorcentrum.hu/files/article/file/61286577128.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a56107d86cf82127b32fc8ed66108e64/buzojejademenazaji.pdf
    • http://bike-aholic.com/UserFiles/file/zurakilako.pdf
    • http://aqbnb.com/uploadfile/file/xosozovamulowiposalo.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd246eaf2---manuvu.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/8718112224.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/55156416773.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0036ee6f8aca21ccd723c4064b8bc29b/luwakida.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608111f7ad4b3---21512094507.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=yaskawa+v7+manual+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae89.bin
ce79e08435d2962b0033677abb1265020a49a8e5f3bb47cc4ca7edcd106e9769		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE89 5348 bytes

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