Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2703f669591f10…

MALICIOUS

PDF

80.5 KB Created: 2021-07-01 19:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35f5cbd308ec32cc2b15cd78ed1f7724 SHA-1: 738aafcce7906b76ac20f6c59b777b10f971bbef SHA-256: 5c2703f669591f10d69e87b9565cba8361421484d696bfd4ac14b51372e77a09
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites using form plugins for file uploads. These links likely serve as a link farm to redirect users to malicious content or further stages of an attack. ClamAV and ML classifiers strongly indicate maliciousness, consistent with a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1717c32b06---tukipezotixeso.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ad834a9a1aa28754b8c1c37dedb636b9/vumaxejepivefo.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/43543356035.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acc14f0d428---91026915808.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/dhjgj2tp74hb2ih6pe9fr91dft/mijinujejupuwarubulupu.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/pipupubo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71855082ee---laralozizi.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/fudumerigafinaxosujuwug.pdfIn PDF document text
    • http://poorclarescork.ie/images/63439397265.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f269eace---98274437704.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/jiweduzesenoriwupimadasim.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/bidisivanupapafusaju.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1726c8160d---ximetuvopa.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jqdgdo6icokejp55if74aso5na/pefujezololufofi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608481c8d2c5f---jisesinazujubonebenug.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/ziwirikakapewones.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ed4370b9---kosafu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/vezuselidobosoxagibumis.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/sivaropa.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9b83c2fb6d03ba309f935f2374ea0ea4/jejudopar.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/wibaselar.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/76492985761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=toller+lane+roundaboutPDF 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_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 16968 bytes
SHA-256: 1a85627e7a3212acb069b8a0dd19113d29220a379e78f053cd691a651a510ff9
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 10184 bytes
SHA-256: 37099cb9c725109e3a0c33175ab91f3df6697f36453c10b4064b0ac3651ea2c8

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