Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe1a029d83b488b…

MALICIOUS

PDF

81.9 KB Created: 2021-08-25 20:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a8753b65d54a902d2ce22008722167f SHA-1: 3ab37c21ec73e1c351d0eb15ef1e223c4c670c71 SHA-256: 4fe1a029d83b488b88448953641640bd7140e1d5a0e67609160c9ae8baf862ec
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://argekaucuk.com/nbg/upload/files/12294564715.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b7b9bf7f---pebapagati.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37758793549.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/900d2022e903c7e0f4aa5c4d34032168/tokazezifiz.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e67c3234a44---moxoxumiz.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/47368324405.pdfIn PDF document text
    • http://devison-matras.com/upload/file/3226592110.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078acafd9755---malerunebu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/17831016266.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/13477171799.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6c3525d1f688fa5333bc7531e216cfe4/vetifekedowukonudevimukup.pdfIn PDF document text
    • http://medrea.ru/upload/files/35630114347.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/gatekolebinofasiw.pdfIn PDF document text
    • http://africareview.in/userfiles/file/kuzumeniniwupumom.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/81802164093.pdfIn PDF document text
    • https://rcot.org/userfiles/file/46173856631.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/sasevafototar.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/wevezodoposemakofipixar.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c441c6148c8---25353831695.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/91954006053.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/2e4ae8340d6ae0206487a820e14013d2/71398274766.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/99554084796.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/6041465592.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c58993a1a9b---39288877564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=onone+perfect+photo+suitePDF 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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 10492 bytes
SHA-256: 48db38711fad87f34076ed04329a38cbcbab53b3bf70f305381d51e87333185a
font_02_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 17572 bytes
SHA-256: 778a95cb9793c0284231120d71bb53db4705ac0d367bd3347a92b5bef2902ec0