Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca8e1177c728827…

MALICIOUS

PDF

93.5 KB Created: 2021-06-28 12:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c03a0f8aee3e0535d5a2755d8c03e7f8 SHA-1: 3b18dd14ab3944efe57417cf5976a8c3d2bb50b2 SHA-256: 9ca8e1177c728827c72fde126eabefecbf8b6fc8d9af87bc94cc5abd6e1c5bf6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for distributing phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm suggests it is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://kurtoglumob.com/upload/file/86103803212.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7j05ags38isqm8kgc3f5jv4c22/kebewete.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/bufajasuzijena.pdfIn PDF document text
    • https://123natura.com/stockages/files/bazapuwadobaguzubofe.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/t8rpt67mn8r3lcfvk40g2qist3/motekelakepowopiru.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2jqstf2sogacrh9t17m32smb23/41950751424.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/mivinajawazadufexetumo.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/f9105f52c9521851a60853c27a1b1f02/namudex.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d01ba3dbbd508a27ff588f57a75610e6/lojipilabaritutim.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/65911429050.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c895ac94a05---77028345778.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/wokejuzoresobevodubilux.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/wapidazevoselojunozi.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/39673917433.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/sajifab.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/f8tsk2ta5l56o8dkndri30jui7/33291723561.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabb6a736f---vinalorasod.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/gemobefaj.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac294ce4570---81399277689.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/198374da621c063dd912b2c46dcf1c3a/labijukopo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160737f78d0a57---14898446461.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c863f75ce69---rekubivafililumafokib.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wujozapazoga.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b20d3a90e177555b506f50b19ae4907d/15981888173.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/24d47b7fcd01c582ef27be3d831c53d6/lekelukivol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=earth+day+writing+promptsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 10844 bytes
SHA-256: fa512d3fb2662bc2e7c93c9ddcc761e2763a28f78b5c039ffccd0191e5d169f8
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 18360 bytes
SHA-256: dd9d2a2aed3670e0db29bc6c8558f5a5322f92603501e8d63f590672aec1ea78
font_02_sfnt_off000137c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD8 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742