Malicious PDF — malware analysis report

Static analysis result for SHA-256 609b07c2b0ef3558…

MALICIOUS

PDF

87.3 KB Created: 2021-07-06 21:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19c50bfb88fc7c4ec9e8b04b09084fe9 SHA-1: db4854c72a2b9c1d0d530799ee9027def27ecf66 SHA-256: 609b07c2b0ef3558d7434b645f5523f50f0cd12cdaaec8236648b02bb2bd2175
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5768

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 http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a3060061ef2---tuwaxivirelatoxav.pdf In PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/8327972456.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8fc0df0b2607afbaa42653c71781566c/57336009147.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/472f8cfe741aa30f38677a3ccba069bf/fitaliweris.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/a6ff3c087a54ed38867524759ca7b8cb/vexukudefaxalizotir.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/54219488344.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///pubutodenabitiwepuloraj.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/tugobezerutibi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/832ple4032d4r4vf919eum2gv4/92135131878.pdfIn PDF document text
    • http://christopherdallo.com/file/62014469864.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d3e1e65c---78443544780.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/watuv.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a8ac292e1ed6ee8e15d217a9a2f0461c/fewirogozupesatamabajigim.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f46efa1d7e---22764524996.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ekbn7jti94gjaokjrrd5otm304/jisam.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae4a201a47---91180150617.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/28279165577.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/xidotorafuxudoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=use+the+coordinate+plane+to+answer+the+followingPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 10992 bytes
SHA-256: a4aab72b21f9c20feff721089ca6a3344bc486406d99632d03f34f8973d3c4ad
font_01_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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