Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b0c01c721bb269…

MALICIOUS

PDF

71.1 KB Created: 2021-06-05 08:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf46c3876c0c6d9038d023fb0d1b6195 SHA-1: fac32871dc6b18c885e9cc2832cde4bc80736dea SHA-256: e3b0c01c721bb26953010120e6951447263d808f3791b63c5e1d745002df1551
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that directs users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://irlanc.ru/uplcv?utm_term=cricket+wireless+phones+walmart
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20fe34f8b---ninomemaxegef.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/oinfqjpnk5gu3fdo314pf5p431/wiwovivuji.pdf
    • https://eyetracking.pl/userfiles/file/fimabatogusoxunab.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a64df169879173fda6c8d99991f3c7fa/memida.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/nolakude.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/89077887580.pdf
    • https://nikosdimos.gr/userfiles/file/tawam.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877731c1a21---bobelositakoxumefurini.pdf
    • http://chiengthai.com/file_media/file_image/file/vujugixuban.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894c808e4c7---51652403106.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0f49278d---gipademona.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608460eb2cf6f---50765447314.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f1476e646---45218389873.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81fb9abf62---45647782514.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d961.bin
f9df2f957cc891c2ca2f4c904828aa0c79c3d3ae5bdc10c3724eb7c53a5e2d08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 5232 bytes
font_01_sfnt_off0000eb18.bin
088b658e7af9d189013a0d81c06d60d4b1c0b103dbb5ca9e9366be2277546321		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 10828 bytes

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