Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c3a2ff71160d54…

MALICIOUS

PDF

70.3 KB Created: 2021-05-27 02:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3641309c646449224db5460961bbf4d SHA-1: 1486b5866718df4acce0e9f1fc2f2c546a2a3943 SHA-256: 66c3a2ff71160d54c7c33e68ec194e92ab3466c29d6f22b6dc3e15b7b9861399
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are often used to host phishing pages or distribute further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9f3cb574d9269b36df850ae676b3db59/94388681069.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078139961cfe---67523238552.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0bdb7eafe---53679832469.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bf367d027644d0e97dfa4dd1ed3673c0/89710333252.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2i9jgu65qosvdd42min4qapv9t/65289507109.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2971f5e947a96851ec25a9d9b16c8a6b/refuwazedamuvilifin.pdf
    • http://komputerzagrosze.pl/userfiles/file/16818811589.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/auibmkt2c9fekgbf53tq7bhvja/164765645.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/0mqftridodcovl2pvb47aav7j5/tufapibuvibozaxigabod.pdf
    • http://dgjst.com/upfile/file/97816094803.pdf
    • http://brmxn.com/userfiles/file/20210522140522_ryf8ha.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8720bab3bc5b21e7b756b7fce9f393b0/87919059988.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/15221a154d8672f32f8d6eab5a866a0d/72663483285.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0ec44224---werigujexolewididezibefun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=regles+du+jeu+dixit+odyssey
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68a.bin
572fc43615fc6fb3ea52a54536629d1b594bea15ecdd559966455e99d6d3d274		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 4716 bytes
font_01_sfnt_off0000f6b7.bin
8f376cbcdb8aebd5d0a2bcf69fb0e160d69e90727a02e66f5256ccabe61c6e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 11932 bytes

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