Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a38af03451ec36…

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 17:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b125f87dbf54103e7d2ef5bf9aa2213a SHA-1: caea6e6512940b9b1ddae358138ab7639609763f SHA-256: 78a38af03451ec362aacf1c24c693d8b455d646f2471566659840867f1700e5e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. These links are likely intended to trick users into downloading further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as a phishing trojan. The presence of embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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://coretry.ru/uplcv?utm_term=retro2me+games+download
    • http://mastera-mix.ru/ckfinder/userfiles/files/wojuguz.pdf
    • http://laboratoriologos.it/userfiles/files/sejazepilo.pdf
    • http://thy-environment.com/userfiles/files/waboxetifepupapebov.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b6b8d1aaf279f9d414e6a3aedd28bb7d/29204932240.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8a21e78f---wilakitubirax.pdf
    • http://rymwid-training.com/userfiles/file/wekezajipemidewopofe.pdf
    • http://darec.sk/files/files/kitofejaxozujikivewametij.pdf
    • http://bradzo-ep.com/uploads/files/33551093435.pdf
    • https://best-label.com/upload/files/81558201397.pdf
    • http://getsolarny.com/userfiles/file/56242749617.pdf
    • http://asia-test.informacittadino.net/media/files/pidobafuferuvujezolosulax.pdf
    • https://grootformaatspandoeken.nl/userfiles/file/16007534041.pdf
    • http://cl-pub.com/files/files/firupusibawemuvuju.pdf
    • http://lex.tj/img/file/82067943601.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad4b1938fc---xuvasepiremaginob.pdf
    • https://daynexweb.com/upload/ckfinder/files/nofovubabozizovixusatar.pdf
    • http://termosystem.pl/userfiles/file/70516867651.pdf
    • http://lunaleo.pl/userfiles/file/vafufewukunitekozebike.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132000b420ca---70753841412.pdf
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/80307663132.pdf
    • https://grafconsulting.pl/Upload/file/fepif.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bca2b9b04---lapip.pdf
    • https://permargi.com/files/galeria/files/43067842965.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347d1e4ed11---25436347945.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d43d.bin
6f07ba36087589cb33b7bd9f5fc7e44b98fb1cb3e24d29695d21e9a7411934a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 19600 bytes

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