Malicious PDF — malware analysis report

Static analysis result for SHA-256 9952882e6a81aedf…

MALICIOUS

PDF

117.2 KB Created: 2021-07-13 21:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc045496457ae192cb5f24474bb07e3a SHA-1: f83df188c15013821da591677e6c673bdc33e88a SHA-256: 9952882e6a81aedf0837586d2276c9ecb2a7ff2b950fd1cc5f691a185b7ceb54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://drafthe.ru/uplcv?utm_term=and+then+there+were+none+book+free+pdf PDF link annotation
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b75f3e2f8---zedasiluxirelufomekidid.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/emf6tipu6luf67ghr1vu65ha87/8127116572.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f9gat6ef5n2ngpk1rdu3t9rbh/jiziwaxuwedefidipa.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/wekakowisukikuj.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3066fb04627c580c946c34db136b9532/xezegatawifuzas.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/4kinptfm3m5cs7me4gluln2bm3/37495310388.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/14407405031.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/90371222529.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/28823282935.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160818c74c0c71---13286012642.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5e227bd66520418fb45fa7547bb32ab6/67012233159.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1767b02e0---sonozi.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bv1bumgo5ssut0j29qnvu9hhd1/setopativasisejamedefegad.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zutaxu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7rpljqu4pcepnfcn1v25hg658e/sivozomizira.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e74bd30671a---pudapon.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/rabevupudisiwulud.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d24caf8cc---13597630876.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607823446d5c1---xenogusupasetibigeku.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/aaa4dfb107b976200020e4a9dc1eb977/govavobisewomalakurepu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/mdqojj7dioom0dgjdtuc8ifb50/nopujaxerabaluminezupoze.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/57130865947.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a962e32730b---wikazemunatamexudovufan.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/be880ea4ab3a26fbff2b65b643fea0e4/8483752831.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/mijukajokeloguri.pdfIn PDF document text
    • 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_off0001692d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1692D 17320 bytes
SHA-256: fdb8f91dd1bcb46b8f2ecbe7002f7a895e6756e168f1644b08bb56ebe604f29f
font_01_sfnt_off0001960e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1960E 10424 bytes
SHA-256: 4bc827e04fec6fb652ea4c3b97226ca0db6dd63390d2e903bfb7eb66a3368c4e
font_02_sfnt_off0001ad68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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