Malicious PDF — malware analysis report

Static analysis result for SHA-256 741c45c4103698ff…

MALICIOUS

PDF

68.1 KB Created: 2021-05-13 02:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 160614353247f7b0055498786ae75e14 SHA-1: 8706470783815289c4d8a86dcf6f2bbd0dbf7340 SHA-256: 741c45c4103698fffb89e18d754556bdcb98c40750f9fd09bb61aa88ef28d809
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. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content or phishing for credentials. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8581

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://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/5304d2982cf5603967f8fa65d639fbe0/12623966376.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f42a605b1a135a8621a726817bdb6164/25961322896.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/d89lfphtkcnphs4oktfqt173ul/82253863192.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/d6a79c3eb5b115124046def0581c0989/57587143905.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/128b914076729a93cbd47136ac1e6df9/89521758957.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hv18hm3lirqklb3b9k62l44squ/maropewul.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845b437b436---fakojezedodibo.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ffecl28vcstkkkl3de0jgsk3i7/kukiposira.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160792153141a0---27939671579.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c3abf429---ligizawenawapupiluwiwupe.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87704a206---zusibenerabup.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cde47bd05---waxakajogisupuriwezapo.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60b358bda---gipapiruzepupetudiko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=application+form+for+new+passport+south+africa
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df87.bin
73fa7f5f9bf111351ba166e4f9faaeeb5a110cb22a6afb6625cf46e2387ed484		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 5336 bytes
font_01_sfnt_off0000f196.bin
f4f8c321cdbefd973585d49313892f2af7fb4f00680eeb6069057054824f9a58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 11252 bytes

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