Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cc38eb448be661…

MALICIOUS

PDF

68.2 KB Created: 2021-05-17 15:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03d0ca77233e251ca611c271edafa9eb SHA-1: b4cac27f24eb197a23a62037cf88d743e3e5ff46 SHA-256: 55cc38eb448be6613cab9714e07926216ca74555d7737c1877488c438d3e46f3
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload URLs further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/a0c32t00tcicil351av8jfrk3p/gudesetodukev.pdf
    • http://aranykoronakft.hu/userfiles/file/nomosod.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160726504f1f2c---71796047329.pdf
    • http://kartywspomnien.pl/uploads/assets/file/22329647556.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/1414a915ec2b9b62c11aee00ab1fb674/memunibef.pdf
    • http://asckhn.com/acskhn/userfiles/file/51606235173.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/i31pkjq1lh7rje2rortp2a1420/rovajuxibaniwozedijewili.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087c491d0316---25127459714.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097afd25f1c7---47803736304.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab9590b94---bivakewazinesaxusavatun.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3860f505e2e3d7ff4741b1da8dd01d9e/79944405750.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609832451cacf---3398035792.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/t4svh7lor5gv4hsitm2erd2k7s/roras.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608803da9ca95---dakufarejufevigupe.pdf
    • http://simonide.org/userfiles/file/kijajesofebaxo.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d645f407---44592216650.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082034e24bd6---87023676588.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=present+perfect+tense+exercises+with+answers+doc
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c8.bin
fd7c6f8d913917c049b2ae51df708a956663e6da6b140c8be49fdde9c9bf71d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 5160 bytes
font_01_sfnt_off0000e550.bin
63efb702b3ca041d45b2badb33dad762bcc618cd4b56b1a8c935c4a424d0d10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 9912 bytes

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