Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea92e66b4f796a2…

MALICIOUS

PDF

75.5 KB Created: 2021-09-20 06:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 732c6942ce1d0ac9d149cfaf7e0bc4a6 SHA-1: 20a36bc3c197920b8d7b872cbfaf2fb07b83b206 SHA-256: 4ea92e66b4f796a26d070d5ee5254fa151476ffe2777b00d35bd3571f5377d6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to lure users to download content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://autotronics.vn/userfiles/file/mexad.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/wexizifimiboxapug.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4b1ebf712---70534228501.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/munaki.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/84791036570.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/nodajukufojafitazokow.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/60398556134d285e0d93.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/zitokogojonodotezefepivov.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/93640698793.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83068994701.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/98347191662.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/xeduripojopemaxerolobe.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/808752562.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad467eb909---jolivir.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/14185236692.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/roredabipunurusivojorune.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/68533663850.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/76636707278.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///neseloxevusufamojanuzised.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/66451944198.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/66306580324.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe57590ae2---mijoziveloseze.pdfIn PDF document text
    • https://edex.co/userfiles/files/451502595.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/27927929381.pdfIn PDF document text
    • http://bienbao.net/uploads/files/lojute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=filmorago+pro+apk+without+watermark+free+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_off0000c5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BB 15956 bytes
SHA-256: be5a7089b4b48c1b8d414a0900c82c5ce024e96cd9edac3a79fa3b125b91ae28
font_01_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 11032 bytes
SHA-256: 3c63025116dbf0072a1fedb7e155117bff54d5d00e5b0a505f8f12f69dd0c6cd