Malicious PDF — malware analysis report

Static analysis result for SHA-256 17749b19783f2435…

MALICIOUS

PDF

82.5 KB Created: 2021-07-16 14:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f62e448b6d08bb4998ffa4ac9ac4f4a SHA-1: 428f98e7171ebc0d1deac0ed1d24cccd46ad27e0 SHA-256: 17749b19783f243535baea58e61bb136b3f48939299689bc0ae1bc083a8e1b26
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and link farm behavior are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cw-cut.com/uploads/file/kuzepiwizolatazozupibi.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097deb957125---lixagedifo.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/wevore.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f13e99837cb---muromopogajukiruperet.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/vanipat.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/gulimagaxuta.pdfIn PDF document text
    • https://dhesient.com/media/bapipagakibafot.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c20a8bcc0---36120907934.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/jasofo.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/65445136235.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/50494978212.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lolipetanejew.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1mp3omsr1qfluj1t22koa9otum/nuzubunimosanagep.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210703235800.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082779a633c6---81811622661.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e107d8b0f---91288801430.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9ef61c48---dalazuwo.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/95266206510.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/69530467746.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4eaa042b7---59595871501.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/61959280814.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/detobeser.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0512683cde---jiras.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=in+the+heat+of+the+night+season+4+episode+5PDF 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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 10792 bytes
SHA-256: f64dc29d3f1c853a549f2608379cfc587515c1beb9ca1fd3f842b40347272f47
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 16868 bytes
SHA-256: dfa0d27fa889cb75aa4b9feac5d256e32975c303d965171c0b901dae1f4ab365

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