Malicious PDF — malware analysis report

Static analysis result for SHA-256 653e4139a699ba32…

MALICIOUS

PDF

74.2 KB Created: 2021-06-24 21:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c291e15dea83dcccc30c4e7e9ee8932b SHA-1: bd35dac64d7f692ee1c139f3ec5a9d4945f16bff SHA-256: 653e4139a699ba3203e28b7ae1649a096adbc8ae661c8f528bc3db8b08618ba9
154 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7cc4ksgcbv6u8bhonspv4bu05e/69192095527.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/rkuhrigd5dmkkhmo824vp3t0lj/xobeponesekelutefunepezas.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e2ae01b32---guzixebazagemukig.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9bgn67o707brlsff43g47d5ib7/robapepogobub.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7581a607f6---lekobonodabapagutepame.pdf
    • http://polyalpan.hu/_user/file/74116847119.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c93733d022c---32804197591.pdf
    • http://dobrasekacka.cz/userfiles/file/91939459554.pdf
    • http://africareview.in/userfiles/file/sedopibip.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27651b62f---ravikitavenux.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/87188b18b927fd30db663773e17f5e26/xefatub.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073608fd5349---12737904337.pdf
    • http://ahkjt.com/upfile/file/seganol.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/0qc06vp143cd57q2mq1m140gie/ruzuratazemutesepobo.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/00df78fca238d2cdb46ad8b18d7e1a15/labevuniwuzezaluv.pdf
    • http://eko-inwest.eu/upload/file/14185704221.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69e512bd5---gezekesinulemabaw.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d228b62002---86754387080.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe7f452907---77388335271.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=morning+thoughts+for+girlfriend
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a2.bin
93a55e643be35163c28563f282acef29c628864fb66a5df52181a20f2bb473fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 4848 bytes
font_01_sfnt_off00011317.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 1800 bytes

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