Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cd9c56e5b423c6…

MALICIOUS

PDF

74.8 KB Created: 2021-06-14 08:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 76c9b4b7baf75cb2eaa2e3bc8dc23960 SHA-1: fd685f6a03beaaa06f27ba3c99c1555295989eab SHA-256: 13cd9c56e5b423c659ff408b15b91066ba2f5b691b33737347d5d193d45ffa91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links hosted on compromised WordPress sites, designed to redirect users to download a fake 'farmer simulator 18 game'. The presence of external URIs and link farm heuristics suggests a social engineering tactic to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nomylo.ru/uplcv?utm_term=farmer+simulator+18+game+download PDF link annotation
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63a629c35---sebuxizej.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/62311430789.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/28743212975.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/2594135065.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094acbcacdfb---tizages.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ced9f06c7f---29720652341.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc67491af79---13783557344.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160889aeae56ed---peterebujetetipa.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246bf2b804---80224941436.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/nugadixoxakax.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160949308a39aa---73671097592.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fdafb5062---20202784289.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff9b6ad99---dopanivazo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609804776a603---buriforadenenelavuj.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/sorasijemadedewilo.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8261e65663415f03e0ceef23a7fed269/4078521388.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/73kno8t996lh0n77hikvoag68u/mekigexivowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 5440 bytes
SHA-256: d1d7f82e84f4dec75a5cc70d29b93247eea689e60af2f2b56b9c60f59cd4f63a
font_01_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 10432 bytes
SHA-256: 36a6250d1649e7d3ac5634d4d5d22b1af9005056365d0b4441332e5d8cf37fd0