Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da4ee9f6d95e1b1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 16:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be5681be53838eeb1e55dd5a518b8ebe SHA-1: 80c693a955bb87a051023e58c9de1e20395c2580 SHA-256: 0da4ee9f6d95e1b1d13cff3f4e6e79e9072873dc3f09451f726e879c2c14fc7b
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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kemenyseprosiklos.hu/upload/file/kuzokejojexot.pdf In PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/44676f8e482222376e5ac574eb8dda96/rawuju.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/21554363366.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/wezojikanejufaribonela.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136792e04cd8---sulegaxuwufopurimed.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/27383178725.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d1754e0ed0d03924f686fe6a883e3ff6/1974619700.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/72582189918.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/bijikegijakikoxixovo.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/tepafevejamumije.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4b1ebf712---70534228501.pdfIn PDF document text
    • http://reylab.com/userfiles/file/38521954393.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/zelifumemerewusitunitog.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/jowimikoziwexubafujo.pdfIn PDF document text
    • https://masukpt1.com/contents/files/moneguwir.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136baacaf2c5---dotewozomiridonagup.pdfIn PDF document text
    • https://istanajp.com/contents/files/79290852998.pdfIn PDF document text
    • http://asvpp.fr/pdf/konimufejope.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/67976346071.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/30931827950.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/xeduripojopemaxerolobe.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/93971249679.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/zifovoxufozadov.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/bimuvexaluvolufa.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161358f3c3cedb---takonox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=videobuddy+apk+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_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 17868 bytes
SHA-256: ee1faa044f1e67e8f1cd3f55d8b10c8d984d8bf9360a252e84a9a3727efeaf1c
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 10520 bytes
SHA-256: 7d9caaef077e457813d45746c7d775eb08eadc82b4d5404e7acdf02bba21a37e
font_02_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1