Malicious PDF — malware analysis report

Static analysis result for SHA-256 11df4d8c29655c48…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 23:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32975270f087f150979f9848c5bf757e SHA-1: dd4d6686fb7ac806dbcaeeb023c493dd0de537de SHA-256: 11df4d8c29655c48c59fe9ff110a1464e27b5fd093cd411623b3de054f65704d
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 websites, indicating a link farm or redirection scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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://cructi.ru/uplcv?utm_term=frozen+shoulder+exercises+pdf+spanish PDF link annotation
    • https://suprizpin.com/calisma2/files/uploads/giwupovewi.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/sidibovojajozokesam.pdfIn PDF document text
    • https://tcremich.lu/files/files/80373250585.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/sekoded.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb370e7cd---biboruj.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effea2bc3c---suziwowijuzepojidipada.pdfIn PDF document text
    • http://rongqichem.com/upload/files/tifazebepupo.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/93738160635.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49229590933.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/23535058948.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8561225e---20221257086.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/rulosurokulezutidut.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210624151142_5jw01l.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/loxitugituk.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb8c1b88c---37200638712.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/74855550633.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e4319113be82c8b06ea61ae8a6fcd72d/26013256799.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pveq7sb7pela616qa890pnlq7a/39596495619.pdfIn PDF document text
    • https://stopserv.ru/files/file/49216936730.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608add8698b44---92413248887.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/gupalazobuvokit.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/vuburasikokimaduzuzixer.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20aeb9137---90759082549.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/rezexusevudagewab.pdfIn PDF document text
    • 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_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 16856 bytes
SHA-256: 47cb9221c951b4365307840f30a1623405327f75872efc1d54cec338440dcf99

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