Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52a8f0e0a65badc…

MALICIOUS

PDF

87.6 KB Created: 2021-08-01 17:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f29a99bc3854af3095c55e438cc038b0 SHA-1: f9056ac89ddd185952ce83cd8732f9cb7938b73e SHA-256: a52a8f0e0a65badc25a23694c25c38549a78d39fa40da351338b2ad085db5153
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users through deceptive content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f8b4df69---buvidakekileterebakexi.pdf In PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/gevunusomogewuru.pdfIn PDF document text
    • https://tl-systems.hu/files/files/57979800314.pdfIn PDF document text
    • http://iltorg.ru/upload/file/siwus.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/54499485020.pdfIn PDF document text
    • https://taperagi.com/contents//files/42073990586.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/sinogaga.pdfIn PDF document text
    • http://samtekelektrik.com/files/bowonamuguvafezuvet.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/6658487064.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d09loe1elunbdu089r39oeluk7/37991062144.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/kekadudovudavogavegukuwil.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/lokozagitozawikak.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdbe978b18---muforusepajox.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/webepuwukakikuzemu.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/59215639125.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4af5b7d5ce---1009981797.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4b6a120e801f375f30798968c85b14fc/52529417832.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094919026b52---87344750342.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/xinivo.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e48ef9ed---wapavufoxedesigu.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/berel.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708e5670337---1928441753.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mg5sfp93sfjl9n59m89rc421f5/19104153974.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/lawunukov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what%27s+wrong+with+macos+catalinaPDF 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_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 10656 bytes
SHA-256: d2d737d09b5d501dae28d4403e3452858ec5ea2979218212812a359934dbd5ec
font_01_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 16796 bytes
SHA-256: 2b56576efa8241d14fa23efa544af14e7c460de6d269380f0fdef54f89c07ae1