Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3b0fc61851344b…

MALICIOUS

PDF

72.0 KB Created: 2021-06-14 11:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d26134423d1bf7642c8248923144e622 SHA-1: 7e4665aa393c1b1cea4195d6ef30afb0180a5330 SHA-256: 3c3b0fc61851344b4742aae4935b23204353003f2db7b6220c3b1415f5bd1eed
154 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7771

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://synerhu.ru/uplcv?utm_term=avengers+movies+in+tamil
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/feabd2a3281306bac143b0af44fbda18/boxidafukolozirojolageb.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3a79f47960e1dfdb39cc4257b5a267e3/92374442494.pdf
    • http://sportgalaktik.sk/userfiles/file/vanokinamuvizukurun.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803501ed50c---xilawelava.pdf
    • http://contactconfiance.com/files/files/92076394124.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d5b99bcbf14425cb311fd8c2df065a28/sesawetenawud.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092fdd016003---fajolewewifebuki.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b370ef23c2deb6caedcece9109a4c498/tinegijibadolewod.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4690cc5e4c77286e4cac0059f81683d2/gukotawawulalo.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1475ae3c2d57df545d8f272dfd2d9e57/51412880690.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/736b9848e81fb8b076bf6ae6589826b4/tufejisatefezifuted.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d607291c6b---fonopikulofu.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b560f96d08a---lebijefazuxisegajeloj.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be4b460c6---poxevobofot.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083c55d86de3---zukabir.pdf
    • http://birnagarcollege.in/userfiles/file/53224783089.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e5188b94---11347357248.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de97.bin
066e05a6b839fc0b0a5148fcac12d6f3f165bc1e882ae9b6661b3dc9e0cf770c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 5052 bytes
font_01_sfnt_off0000efb3.bin
5f922bcead6b2c8af822a4587944b60aa519b881b3267a968e426d60cf6c8d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 10676 bytes

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