Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d7b4cb28479ffd…

MALICIOUS

PDF

114.7 KB Created: 2021-08-07 01:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8327a4d2d8079b2e24c58ec1c4bd6d80 SHA-1: 13ff21d20b9130b31152d0e1bb28b69ca0652d05 SHA-256: 51d7b4cb28479ffd7ec61eba843dcd42ae627459f7df5adb14a3ffa86a17043f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to redirect users to malicious content. The presence of numerous external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb2ef3316---gedibisogewenir.pdf In PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/guwovij.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf23b7bfd7---noferopimoxix.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/68031410788.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76484625583.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079db10c7914---wunizojuxepim.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/59360706442.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c8914753---33657949602.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/89040272261.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ah64cucnseifjtpgmuglpd3n6r/59736009796.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/62139910757.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950818cc133---befivorev.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af860bcc2b5---rawodinivaxedidomisun.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/rakotixelojuvinogesodole.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/95627107525.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/77469713464.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/naralowixamarix.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/aa82d0b2814bc73d6d42e00369a75e2a/wubapomobeno.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d490ca706---gutoveluniforuj.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jdu3trc7c6h2sr16uscbrcdjti/9807371775.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b5a1dcb5e---vizaposuviselulixak.pdfIn PDF document text
    • http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/metixog.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160822f472023b---28763369053.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/73215018215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=droit+constitutionnel+le+r%C3%A9gime+pr%C3%A9sidentiel+am%C3%A9ricainPDF 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_off00015646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E5D 11112 bytes
SHA-256: f80fcbd54060cf66305be08a8198db881738c056682a8630ea42421c38331dea
font_02_sfnt_off000187c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C4 19748 bytes
SHA-256: c14a171947d3ba402e47282d929fc8b86dfe2f4fad86b9841957b0542c6a71a0

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