Malicious PDF — malware analysis report

Static analysis result for SHA-256 6782c7002c3fb2bc…

MALICIOUS

PDF

77.5 KB Created: 2021-07-15 14:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5cbb034f4bfd4804d7891745c2e0e4b4 SHA-1: e427c72ea156e44b005115eabf8ff790d0a01c50 SHA-256: 6782c7002c3fb2bc558617a68e22b486786a9c4be52a9d47133d048786fd8ecb
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed a link farm containing numerous URLs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document intended to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4596

Heuristics 5

  • 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
  • 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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0fji3hv8rovdldrqtphtm17nm7/12639727491.pdf In PDF document text
    • http://amadpich.com/userfiles/file/37907336050.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/22071867079.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5686710f8---35587667513.pdfIn PDF document text
    • http://allycatering.com/userfiles/gopovusetuwizokagemigidag.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/30293083280.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/5122767194.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/16512206851.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/wopup.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/r4920eq55upr2jh52gm0qt5mf2/vozobetezakopigigere.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/ritijamozujazobijinetoje.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/k5oar82icsp9ak1hpj231gktcc/tosuborex.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b36020f5---nogejetapi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc03ae61a---73848546236.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/guvuxoju.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/85077056934.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dhiqt2t3rmra7ct8rro9cce451/jobifibudisiwabokabuwifu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f109eb5a3---85778251421.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e111488bb---tosalibejeduwiv.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/jenomedekuvidolesem.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ub4ob7kl7g6aou279d4678ogke/xijinubebi.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/92171142807.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/21443047585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=charge+rn+resumePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 10332 bytes
SHA-256: e8835d0e1ef0da109a44cab546204e596211b6d716a3d5230a071ea4154b3da1
font_01_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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