Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6514409e5ec2506…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 15:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 83892215e92f242af9309554c28c9669 SHA-1: 7a6cb9c0f02a30689491c863fec8f5aa83a3f42c SHA-256: d6514409e5ec2506a3e0b9cc4eeaa85ead0fbbf74f59cec61fd87d2f4567dfc0
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://vicotelecom.vn/static/source/images/file/buzebosokitominisik.pdf In PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/suveladiludevutib.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/metoduvukosa.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/bebexovefajifo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b5b5d99fb---gulibural.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/jcdt3fec67hk6ucqolomti7vd3/76291093634.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/19144409067.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84213e883---39870178735.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/naguwotekunesej.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/xagilojoweximunugux.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/xusokoresimewufebaxi.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/85302465436.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2bad0ad37821efc48edd59037fe49d40/99880933074.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071f50b18945---49562424327.pdfIn PDF document text
    • http://llux.vn/uploads/files/newupalu.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/87505577521.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72fedde7cf---bipimakubolotu.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/malalutifot.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c091915ce35---45931224735.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/kekosinerugari.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aa8b40f77---25676381947.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/61150870772.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a82416da54---sitofasakuvikoripaduz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=first+aid+after+225PDF 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_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 10308 bytes
SHA-256: 0a092b40ba59aa8b66a038d858fd807c6859f733836fe58da8c1be71c9489fde
font_01_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 16840 bytes
SHA-256: 64e9d9689116ec06e687409a499a8fc5a9ff27ceef965a45e1db57c9c7f550a9
font_02_sfnt_off00013893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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