Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e33aa0970bf5989…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 12:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b0cea993a6ff3e26a7d95fbbce6d4fe SHA-1: a93589e1f98a06e01473484d913abd0b22ccc372 SHA-256: 6e33aa0970bf5989724662b9aa2fbfceb4bfeb64064e36bf61722df2921bc66d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5920

Heuristics 5

  • 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
  • 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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3fd266620be74cf56f6b19a4cfbb9c9e/21884270038.pdf In PDF document text
    • https://avela.md/userfiles/file/17308485597.pdfIn PDF document text
    • https://pmms-online.com/assets/file/57078555103.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/novezofexebuxixafar.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/wilifaxosiveriditonovo.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/refonokixew.pdfIn PDF document text
    • https://combrooncom.com/contents//files/43857146677.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/vuxizozisijajukewiboxi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf9b7e9d6d---dulevajeluzitobufodano.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/93731022482.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/35311369177.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/292030a3e3e489e7d22083a49b27a84e/64872173526.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087c42e5801c---nizikimadinamulitivi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/856da572542ca0a14f8b047fc443543a/worojax.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/13488446076.pdfIn PDF document text
    • http://sushibelovo.ru/files/gekexusokujotu.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/giwagomuwovatatuboban.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/xumiwoguwovuta.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/29a1822f29609d55967a86309ce996aa/68496431583.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fdf3a122---lararop.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69d03aac9---50164792968.pdfIn PDF document text
    • http://pvvc.cz/files/74536316053.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7e413104---96091625455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=where+are+you+going+change+into+indirect+speechPDF link annotation
    • 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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10956 bytes
SHA-256: 8211375ad146f6da789992a9cb3f0de90478a72bf7b1677a4db3bb09348876a1
font_01_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 18560 bytes
SHA-256: 899fc544a6672565e75b3f70d1f49dbde8e057384a4dec09299e8a0e16fc123a