Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9bf96afd99c28e…

MALICIOUS

PDF

137.1 KB Created: 2021-07-14 08:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9685e640ea37b67bba3e4316fbdf1a47 SHA-1: 02e95f26c9e86103996c8f60bce90f9b15bf4627 SHA-256: 3c9bf96afd99c28e22e169be5699ff079e8b4abf46f72348295f6d9912a0896b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://zulassung4you.de/bilder/file/saxewonevupo.pdf In PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160754cc3a9122---webewil.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/wegavejut.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2fe84796a---95337626478.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/zajomapilekirip.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/dikezavuvus.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/85919545081.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0c51gg1jrevmb62ooml9c0inij/rerarolebewiruzuzimatoni.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/65810008171.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/54810511143.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/012c6f465d7286742d0a290b8536e4b2/49793375931.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/3467508186.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/b4hldaoggkao0hdakmaq61bc12/60876585097.pdfIn PDF document text
    • http://gtshotel.it/images/file/73974229644.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ab3936a5e7eb61e8bb3200878d99a7c9/nulorufuzakanezezop.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb7cf21a9---79710376466.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/lodafapebot.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9ac88a1dcd714ab1f9f33e0caa718547/giwutanet.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c3130f573d1f572d1f3e53762ac145ed/89729780023.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/38792909212.pdfIn PDF document text
    • https://zold-kommando.hu/files/mozifopigifupovekuvanu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445881e528---manotutumubuwokemoka.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160716bb365b35---meroxuzitenubuzabav.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/40a57730f30eecab4d1379b26690465d/25336152191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=protocols+in+physical+layer+of+osi+modelPDF 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_off0001b3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3B3 18156 bytes
SHA-256: 6ad42799498fc3123dd9bddea928e861799ec6c75ece204fbe5a3abf98de225c
font_01_sfnt_off0001e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB2E 11000 bytes
SHA-256: d3f7062ca566e1ce3049a1af79a705ad182009bc2467b9d3f948666a6fd060e8