Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8ae33bd04e9214…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 06:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b0f87f2c9390b0c79163b363ad30654 SHA-1: 5cddcf42585873cdc5ff197091496e1d715d2526 SHA-256: 0a8ae33bd04e921410472ffaae082ece2b480f32b65eb071d73e7a3a4b00d6b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=small+cell+lung+cancer+non+small+cell+lung+cancer PDF link annotation
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6c2a9ebc---goduxuriseriralebi.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/93422727989.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/rupegenabovenirinotow.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/koborupere.pdfIn PDF document text
    • http://soles2walk.cz/data/file/vixejikigazed.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4438cc1c1---rizetewenuduti.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc150db80---nupitusixav.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/ba576efd9344943ebf49127527826b24/94179147890.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/sarofexixusozovore.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/19733111696.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd764f3974---sugoxuvif.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/99264271230.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/34270930080.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/12318587966.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3ski0ff0e1k9qi4h0hi371k461/41533053128.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/83584360068.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/87587440213.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/86315620918.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607169ff34ccf---16074956785.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811b78954a5---zogexowivarawuka.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b017e7099dd---89321491048.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/517037c9fa27d75da814ada5af30bbf5/20778597917.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/kafatarolavufajoja.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/82382689326.pdfIn PDF document text
    • https://nasikampung.info/contents//files/sojonemusiwuvenajawujepu.pdfIn PDF document text
    • 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_off0000c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 16520 bytes
SHA-256: 7bea98047542526596e78a8298958863c723aa1947b2049b3434ea4e126658f4
font_01_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 10560 bytes
SHA-256: 4d693dd0e2a162efd1b9da240e0a8e37720e07667eb52fda04eb6fda1de140bc

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