Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc423d53afc6f4c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 07:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c48e34af51a6d8a1bf1eb35cd3401ed7 SHA-1: 7479b3f9ba7c76a5ee64e9c13c86ae5188dd133b SHA-256: 6fc423d53afc6f4c6c520a6a5a1e52a10810e2b74905eb33bf8eaa5ac8373719
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of redirecting users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://huntic.ru/uplcv?utm_term=bdjobs+cv+format+pdf PDF link annotation
    • http://oceanstatevolleyball.org/clients/879495/File/reguz.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094152c718ab---pokolejigiki.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c010996f27---90561310407.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/lolivo.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/eb1ebdc4bd96ceec44af2db8d72742ac/69027117475.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/93eee769eec2a7485d44f2a5073922ea/fijopevekepuzebox.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085215ae4f80---rebivokipopijak.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/13850902606.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad192fdf6f3---68016665323.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/ramelix.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161028f4d6af6a---rotadativo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xonepikaxoji.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/zoxuguxegaxotefof.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/jolomemakazo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610f047279c5f---48068742638.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/91736746015.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/21039049538.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/20b25d75b9bfdb38398744b359dde248/gejirekejelezudebafadusa.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb6c84a2480b2b385460d330b47201b6/mibugevefuwiveloz.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16242276738225.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e534dc45e71363681a76ad636f2f6a5b/gekubo.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/zofozuxigefapilededowuwim.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/23373647949.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/55718616243.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 10796 bytes
SHA-256: a67bf7607718180609143cf0ac69b47ed102f28cb2709cbe582130fb7c6cab2d
font_01_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 17384 bytes
SHA-256: b71d579592e15487cd398727104f56cc4475c328116a2e5b28a2c3005c8c8049
font_02_sfnt_off00013148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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