Malicious PDF — malware analysis report

Static analysis result for SHA-256 812437367c2df20c…

MALICIOUS

PDF

80.1 KB Created: 2021-08-27 02:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: de1b6f0d47f46005d5372045628c5e08 SHA-1: d7350ea6146be37356baf96bcf61e1c157044c94 SHA-256: 812437367c2df20c7f72d64ad89d4d71b0fd5b2ee2274a0879e085e516e4edaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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 http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raresezagipiga.pdf In PDF document text
    • http://geose.ru/userfiles/file/26276103031.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/37794804805.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6f648771f56432d64d2d69ee34fa3ffe/94907308767.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/32119189197.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/10959496541.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/21852137794.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/xupanuvazalava.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3804502f49fd1fba3a77841af1ade049/jiruxobesazigibofivosil.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/51485556140.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/35ebd40d12dd6178f834bb776ba8f45c/88442467246.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/00d4e9d4ca41f95882f1e0ab5cd9eb3b/7833024618.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/99283738049.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t33mv1ki438cttm5s1l4ukdgr2/87000929767.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607286f925c9d---4786314910.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2df821a2---54471616733.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/57636461719.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/12509618843.pdfIn PDF document text
    • http://patroha.hu/file/45437922147.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/77447548429.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/vulopixivuri.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bcc1039ddc5b07c6c205b94f37849f9f/40588667414.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/valivajabuw.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6afa09ef9e---17311147235.pdfIn PDF document text
    • http://grupophi.es/uploads/files/62170264868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=manometry+test+resultsPDF link annotation
    • 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_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 16524 bytes
SHA-256: 1f9aad8cdd6cf91a9ccf2c5b87c6b7d40465e913f413a606fdd0cce9f9e5ac80
font_02_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 10384 bytes
SHA-256: 2175cf29951f3693d4f16bdf9589330526586fd45573f36a1481e0987092b795