Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa702a68517f143…

MALICIOUS

PDF

91.4 KB Created: 2021-06-26 14:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b36cb440c31753cc83f38c767556be0e SHA-1: 06a4f440bb7ac185bd365a73bd27a45d799c203f SHA-256: ffa702a68517f143099a4faa0e66e5da0cd25c49754598e9951b92b7c405b405
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers strongly indicate maliciousness, with the primary function appearing to be redirecting users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://shelton1961.com/clients/35589/File/xoxexagorewokilutugotatot.pdf In PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/v0cck5kiputj77pe4bauvjqfiv/46285976009.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5f6c1865cb26a90a400c803d5033be47/kofam.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/vozenanikujuxow.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081041c2b338---43646586148.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/81419322714.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/zefugedaruxev.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e80b2caefcd61ffe6b214fd5db9d8ba4/pikorafaturumupeworum.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/vurawigijufipi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b259ebb765f---rixiremaliwemiwexule.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84219241317.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/senaritamaka.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a0926c662---51606794370.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3ee2ca98704030742fbaea5cf8e2e59f/sunoxowopezopu.pdfIn PDF document text
    • https://ksboutlet.com/file/files/13583447538.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/b07a59827430492a63c8e458410edf05/72939922742.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075159b4475b---xaleluresepoponani.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a28748b04---letoxuvagovenojozenimeni.pdfIn PDF document text
    • https://actor-conseil.com/files/file/29300642797.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5d11cfec---71027842447.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/dajubisamopewawonasef.pdfIn PDF document text
    • http://shosholoza.de/file/95694492105.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/82273876467.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210608/1314047857.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f2ec7d05c---41924353568.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/bevufetamaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=accounting+text+and+cases+pdf+downloadPDF 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_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 10964 bytes
SHA-256: 242c984fa251226fe58868c1deb0159f528709cdae8345e3fa04f4f70f44cfbf
font_01_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 16996 bytes
SHA-256: 0d4fe397e0d0c5e8584dcf4c4793734096833f2bb6f7872c37292327f355f0cc
font_02_sfnt_off0001480f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1