Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d806296833773d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 07:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d5dfb0cec58b69544f879b972ebb411 SHA-1: 5c85275f3b6eb9964dd4f51e4323bfcc1b026263 SHA-256: c7d806296833773dfb7d793713cc32587dd83de0d2621c126749692f15a2afba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple external URIs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be redirecting users through these links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://client.diffuse.info/files/85197870830.pdf In PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/zelexujexavipenubuzagus.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/81216241152.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/81952021017.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/lurijiruvet.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/495b4rrl3me4f05vt82h9s9734/69027438816.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/gozepog.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xerebilumekaxebodav.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/28560076287.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/togesinigigoxapinid.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/29803522951.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/29903290205.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/81466388086.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_7C41D26B0646E181.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/65157423785.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/6575621231.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/xutatixagupokujavid.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tvdu58d4lfktmf8j22qcil31h8o5gv1o/bigokekujedediwizag.pdfIn PDF document text
    • http://coachhouse.info/assets/file/zeximagidopajotu.pdfIn PDF document text
    • https://rintrans.com/files/pojowekagewojepugel.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3e8c6d43---rewobosasusanod.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/fufobagilabava.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d030a71f88---mufasusavabamekoriti.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/83369429264.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7a990d929---jagudijediwez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=easy+transfer+files+from+android+to+pcPDF link annotation
    • 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_off0000b311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB311 10880 bytes
SHA-256: 34db021bb52395173827aac7c1ec467b0e0496fb364337a8426afb2c9a61316c
font_01_sfnt_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 17196 bytes
SHA-256: c22b77bf5f97d54f633ce8f0c2c4808642ebba5ade57cce03b478667ade99692

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