Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fdec9f05dfeb07…

MALICIOUS

PDF

101.1 KB Created: 2021-09-08 08:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50d02138c7f0070d5f9617a623e44778 SHA-1: ab5f4897ca9430297b1a8405ccabf538ca4e38b3 SHA-256: 31fdec9f05dfeb07ab324648802c80a88d19fe8fa5d053151d19b49b163139e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the overall structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://ketchas.ru/uplcv?utm_term=the+founding+of+rome+worksheet+answers PDF link annotation
    • http://techniq.ae/admin/uploadfiles/file/xajupilamovalizupi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611611f3e9c02---manadenefiwanogobexomewut.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/855c655894e4422f0b460c5424888ce6/gukag.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/lomisudi.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/mezikipasinonorib.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da328611d9---11859734332.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a0dd980c---81470761886.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca53ce7ca---kinagulub.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2df69189d39c3996bd4fd1af33188e19/pudapepu.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/netamatigugarosaxelefopor.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a1c16478b---mugikaseke.pdfIn PDF document text
    • http://jiab.net/userData/board/file/85056509879.pdfIn PDF document text
    • http://btfa.tw/upload/files/zetube.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/mizofepabigomi.pdfIn PDF document text
    • https://nadamasristorante.it/file/tovegow.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/pirero.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/88188979346.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9e41eaff17a5e7e7e4d03f01dc8aec27/mivatonuduwexubodutonux.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/gobabasupoloma.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/18343568265.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24775c25ef---24751814213.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/55601347851.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/guxivujuvelinuxepilunuwu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ni7c3vgprgkuu9u9hsdei6i6e7/wuwalisonagofiretowuko.pdfIn PDF document text
    • http://dothi.info/images/files/56466443876.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612191c8397bb---pepuxozamefabirarofad.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_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF0 17832 bytes
SHA-256: c648362d78251b38e8b6fcefca97d4278c294d137d3b5641336f3c2bca3637da
font_02_sfnt_off00016cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF3 10996 bytes
SHA-256: 391c9c1f46317cbe80d9d0cdaac9304eae6d1e2c4df19d7297fb1933ce2becfd

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