Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4b263a14cf45b0…

MALICIOUS

PDF

87.2 KB Created: 2021-07-04 21:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 02690b888d3869dacba106238a420b8c SHA-1: 43f086f68d772c3ca68c1a13f669e7b2892b5dda SHA-256: 9c4b263a14cf45b05d13774b60c3d12a6ee89f66ec1f1faf93aeadf6b8b3c50f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the link farm heuristics indicate a likely spearphishing attachment vector. No scripts were extracted, but the overall structure points to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607126a505278---kigutinajibadux.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfec4aff7d---puseriso.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088720106b15---porezasulu.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/nularonipikol.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c298b7883e---97824712585.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/6qsqpkmh490ebdo67f10e2iv6u/risagasogix.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070843dc3397---depiwelepivabipasumame.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d9903f5db5a05b1fa1a4798ab773a2e/garofox.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1g0c2jtl1dp5s94eam5p3vcea2/feteko.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/383c21d2840334b067d9f4087b8a4997/8319826639.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3c8d6f22---pafalevavimovikepozinutel.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a1d623bed4ed73d2ee3e6a28ef1b794/zinan.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/05a89e2af5d6320538b3471aa27e4a83/sikulu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/1ofmqvh8mouvdtt3gd5o87d3li/mapuraxeterovafuko.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b986cf9eb3d---mufifub.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/6f43ai7b6o1oafllr0l8bckc2m/genorejigejalarotidetadum.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4267bf25---visizijekegedubulas.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/47057512159.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/kirufuluduwudo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f218e1418---tilofimiradakixojarunabad.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f330eae04e---57363356017.pdfIn PDF document text
    • https://zold-kommando.hu/files/tepatomu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/vodovafitigugezoxatuvufu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b59ade4694---64835020835.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//27663224897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a+doll%27s+house+marxist+analysisPDF 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_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 16444 bytes
SHA-256: 42f293ee9276bdeee4271d1c96caed43cd5dec3aca7bba3ca268346c2444465f
font_02_sfnt_off00013497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13497 10844 bytes
SHA-256: d5ba3055df5fb3f93842f731cf1f8710252dcf86fca8d7813c930b91dd9f1171

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