Malicious PDF — malware analysis report

Static analysis result for SHA-256 c434813e5cbd1160…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 16:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4625a994cc5ee9157542d193569a3612 SHA-1: 0b94866b86c88070763bb4d26075a441f34f5006 SHA-256: c434813e5cbd1160d38dbd9a6310aa239b355bd2aa50ecb7658a8af8595ee7ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/61144a26bf79971430e5f560a3f20386/20652595338.pdf In PDF document text
    • https://aayams.com/userfiles/file/kanedavazuwo.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/185377261460d494b1b097a.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/47191626090.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vksrn2duc30sj80ovi2f8tab3c/xowurikol.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/98105419053.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/98425977777.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608401989d505---50414948109.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e8e03335755349a19c2afc33370f4b0/bawivoxekagesu.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/zepimeg.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/moposapetowizefuxisizum.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6247fb2f4c11241e55bc9eba4a7d9cb0/junigurezuzab.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/vefibupiwujadeditokuradu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e21cba5b71---8097943311.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/52533932535.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/45201229761.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/sazuvolozuvepofajebowufu.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/17557868952.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c934377d2a250d047e5974d096c941cb/xobobubabepapopavege.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/jikigozanej.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/bufazeba.pdfIn PDF document text
    • http://gojjang.com/uploads/files/29868291736.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076182bb736e---2988223544.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/16407463150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=preencher+formulario+pdf+onlinePDF 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_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 10720 bytes
SHA-256: 60b0252d2e46c4046547bd86db7fb027e70e9f64947b3fdf75900109c188f05d
font_01_sfnt_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 16908 bytes
SHA-256: 2d16b47b199f5659e4fe93464b037bfec35d0617c48d030652951ad85cf952fa
font_02_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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