Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f64f758c2dc7629…

MALICIOUS

PDF

78.1 KB Created: 2021-06-26 06:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 817259ea228e229cbf49c10f9bcf1c4c SHA-1: baf7250cdbbc19f140dff8dc47b28d781cc6ef0c SHA-256: 1f64f758c2dc76298f6eed70e5ca2aadf916b1485b7253c5fd13a6e5a9162c74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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
  • 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://smidgel.ru/uplcv?utm_term=someone+drinking+water
    • http://kadh.kr/bobod/upload/file/xesabevu.pdf
    • http://china-engine.net/ckfinder/userfiles/files/45651016151.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6890a1b06---63243399745.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9961230b---lekiborebamasizenimon.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be5c1e67c24---jinibizunudipisanego.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607403684deab---tebidusukezeletusazufuv.pdf
    • https://seikai.jp/free_images/files/62039897955.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609416c0d0abc---59240376867.pdf
    • http://toshiteriyakiburien.com/uploads/files/jolumijogemipo.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa246a11f43---61314923518.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/83973487012.pdf
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/gijur.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a697db95e21---16124043791.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160850f731ab59---62917914805.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160729e00617c2---fekimedevekonuwonisa.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b4a86c096ffb44d72988110a66dfb7b6/60260660957.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/qjmf0334kjr5r4qgibroiagn92/72821373924.pdf
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/dopiris.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/j38e744huu61hqaii5e4cndnr1/39826421122.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f691c8c94ea443a42f9377ef0b93ccf/lekom.pdf
    • https://accuratesearch.com/userfiles/file/medumosirovovakedebini.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hbi8qmr2kvmsmpmkue6un0nfo8/taxulane.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf9e50382---kufexef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8b.bin
9391983e15b07f4c39a69b1e562da43efc615b2b12bf9096d8a8e67e8251b534		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8B 10628 bytes
font_01_sfnt_off0000e5b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 16792 bytes
font_02_sfnt_off0000fdc9.bin
d274425a0d34460f2daa746d1604f8b4f248e9bd458c8d24f9c26c46bae7701e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 17312 bytes

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