Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a15f23de0284b1f…

MALICIOUS

PDF

59.6 KB Created: 2021-09-15 05:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db244cd388091178ab1cf19332175460 SHA-1: 9c3562c7c6db36c43d89cb2d9df80e03b3c0ab36 SHA-256: 9a15f23de0284b1f3a6fa66cb654d914685b6b7f105d41ac95c71ee4e992336c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures that often leverage embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7008

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://inwebjor.ru/uplcv?utm_term=download+gta+5+files+for+ppsspp PDF link annotation
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/sixojagazadusotadok.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/turofurazubokoxote.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/rokud.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0uidt74vtr5uf3cs13mfej83q7/83113634302.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/19090608694.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///11121808330.pdfIn PDF document text
    • http://ore-processing.ru/d/files/penop.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/sujapu.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/23692767222.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161412e8099df2---xidoji.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411876d0b79---fagiririvefetebukegunu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161412e63b45c0---12876383965.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/nuzifidetoxedapenok.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/76276459275.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/nonafozexeronox.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090900585873499.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/48680437355.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/49812803958.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/13349313626.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/bunoweziposixapigud.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413aa332ad0---40578875577.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/zixifezo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130458a0fe6d---xavabekaxunuxukeped.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/48161784959.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB681 17108 bytes
SHA-256: 034b86ed1bfd0b874047f710d4f32ce2371039cfbf28b1f625ab36eec5cf0d54

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