Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cff7433e3e764af…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 13:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 62e7003c45ed87ab4748a4276d39af6a SHA-1: 0e44e5d1b2357dfbe8633da89c3f364cd61da575 SHA-256: 4cff7433e3e764af399ee3d84981b3bdcc700d7bc99a3d3db4f971b6c273c6b3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several extracted URLs point to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple PDF links and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8226

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://garglob.ru/uplcv?utm_term=kamasutra+book+in+tamil+pdf PDF link annotation
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f885b34570fbfa2f548352802d90d0d4/xisesotutakawe.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/97448064558.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/4009763892.pdfIn PDF document text
    • http://runhouchem.com/upload/files/96467592508.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/43000255136.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/miwuwi.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/22337538790.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/25201983009.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/70665174892.pdfIn PDF document text
    • https://http/www.ma-mairie.com/ckfinder/userfiles/google.com/files/mejixomoxogexat.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/31327368193.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/xewufitufufokon.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/vawaw.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/gemakig.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/97342542391.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/39831439941.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/90296633086.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b2c869ebe0813a983831133396637a37/dunarupadig.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/90205461893.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/26841841425.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/lugokemojixekozozasedebag.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136121a4df2d---pamij.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC379 10852 bytes
SHA-256: 760eedf77a1465a0ba11655cb834309f369f22d24967df4a475bdb13f2f5de2a
font_01_sfnt_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 19460 bytes
SHA-256: 1aa437bdedc24040e05b7706b7bee7b01bb515ac793912ad2da18325e55ec1a1

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