Malicious PDF — malware analysis report

Static analysis result for SHA-256 866fd9d3dd23238f…

MALICIOUS

PDF

98.8 KB Created: 2021-06-28 15:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31f26785318a5e0e0f8dd5ab31674383 SHA-1: 3cccf03426f55f88200d9227bdb0d77be18da9cf SHA-256: 866fd9d3dd23238f8bf603e6243106ff523c73736dbda764b9d434989c338bd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 https://irlanc.ru/uplcv?utm_term=wow+classic+fury+leveling+build
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3781f936---7915807043.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6bb2cefc8---dodewifazufa.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/3vt74f49k6075nj500p53l4isa/84890595797.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd831b5d8---zagotunezolir.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ae29cf8e8a2d27c3adcfc7cb4976d49b/xuxifo.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/njclsu9k7ts70dnuacvclkrp53/1183918960.pdf
    • http://hongdanhaudio.com/luutru/files/15783072959.pdf
    • https://gamaconsultores.cl/upload/file/17140054280.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788eff36717---18133877055.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5e61e154c---fafalafijatavano.pdf
    • http://petukmahaaaraj.com/userfiles/file/69634772409.pdf
    • https://htchninc.com/d/files/57254573375.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac00ba4b5fe---11078925240.pdf
    • http://a-swiss.com/upload/userfiles/file/79505308678.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0e695b59465a390977374006a5d1e90f/xaravorexegutifobosi.pdf
    • https://alteanetworks.fr/img/file/52521132972.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9960d0942974f22c599d872d588933dc/71488758609.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c5ddf209c---velufoxim.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa01dcc89d---sufigow.pdf
    • http://dzbnf.com/upload/file///12553435102.pdf
    • https://indobaliart.com/sitefiles/file/jiferugepijorik.pdf
    • http://hani-bee.com/userfiles/files/499616396.pdf
    • http://chouchouphuquoc.net/upload/ck/files/dumolenupikakaxavopovup.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/abf0c310ac933bcec1759dc847962108/39014822428.pdf
    • http://salinasouth.com/clients/11073/File/gutokapatun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114bf.bin
5500c89eb669ebe36c619dcff166db2b463cb1eb8a9adf3b027524c8009e2c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 17264 bytes
font_01_sfnt_off000141e1.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141E1 1700 bytes
font_02_sfnt_off000149f9.bin
de2a6d46ca9452d5e94458cfcf2d37525d63d1a26dc9326af260cee6c2962d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149F9 11052 bytes
font_03_sfnt_off000163b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163B0 16792 bytes

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