Malicious PDF — malware analysis report

Static analysis result for SHA-256 9514db70202ce181…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 01:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a43ebf57729c100e9753cb1157de165 SHA-1: 3ec58db640b1dde85d54d7c6a7ca7452c5b1c73c SHA-256: 9514db70202ce1810eee1c4629f93d1c8254a64a0d7854d5941250c8b0681d17
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations and other potentially disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://vitacanes.com/uploads/files/82338350654.pdf In PDF document text
    • https://samowar.ch/upload/file/poxaninewukofowe.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd70e1d012---revajuxemidamijebijomure.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/uelnbm2vj70jockqh00ba2c7t8/19376658644.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/37073895347.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/26132912665.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/zisawedekopo.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/womokifugopifajen.pdfIn PDF document text
    • http://irths.com/upload_files/files/dufegeve.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tbj89157ibq91s309q438si1no/73696074955.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e0617f4d8---duzisomuv.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/fudumerigafinaxosujuwug.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/taturex.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/88721527034.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/777268bea6ef5aca3bf2b0961e85a10f/71124370005.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/godeziseguselemikolepime.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/90828477496.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5c758ffca---joxevefitobunot.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/kugiwulipu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/gomulomewivagosaw.pdfIn PDF document text
    • http://usmleworkout.com/files/file/17776854171.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/44011622342.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/muburafujuwuvaronox.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8890d8f9bbb7a3de9f1c91f39ae885fb/13100185121.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/66456696560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rotate+pdf+keyboard+shortcutPDF 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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 18088 bytes
SHA-256: 5a640df7d1756fda6cd092417a30bccbe85c744c69b349c6cbf73259e79efb29
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 10968 bytes
SHA-256: fedf08050d8feb79c3a81ba7ac2619185d9626d4e4ed622b0a5c15347123f41a
font_02_sfnt_off00011fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1