Malicious PDF — malware analysis report

Static analysis result for SHA-256 a348e037c7c54f1d…

MALICIOUS

PDF

89.6 KB Created: 2021-08-03 14:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31e093d8ee4dab60c8a85d26d04225ef SHA-1: a820ae51587ff007b54ad5c60d7d8f5fce392a32 SHA-256: a348e037c7c54f1d76dacc6f8324b0c7de8bf25ac262878c680678cca5cbd14d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the embedded URLs and heuristic firings point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://coretry.ru/uplcv?utm_term=interstellar+full+movie+in+hindi+download+720p+filmywap+online PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a165d34ce1866e83a1fa0dc00e2366f6/14499740835.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/32441548670.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9dba2af55---webaf.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/pafasetozufapelamelob.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/16238895297.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b185c7efb---masuvudumotemagipitetewi.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/21936043303.pdfIn PDF document text
    • https://anfauglir.com/images/file/banikegorol.pdfIn PDF document text
    • https://etadelloro.it/images/file/gizatoworasemedaga.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/laruju.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0bec6369c4c1a4945288810f488add77/3815595868.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/peginoxaxolobuvub.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894deb6c07f---rimuwegizofon.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a6e139d21---34079252204.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/zowujezuxid.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/i4vmaml6s87jvk2s0vatefe0r3/7428063671.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800e6f619c8---kubutakamozijeneputugog.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/leoa2nnomnmcl4405ndg9foqm4/85747578556.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/nuwojimurivobivonifi.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gagezofesirisemixaxo.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/98869524508.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/pejaziloziwonozig.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/45030168729.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/tonobubef.pdfIn 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://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_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 11372 bytes
SHA-256: a1d87a4e22dcda2ecfd49bd971ff1ff1a8429e76367e06de4fd4d520dc47a014
font_02_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 16640 bytes
SHA-256: 28736ff6eb34ac8179dbf59533f3c468deb41872027e97d1d5a66bb58a2df9e9