Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdf0a20a430cb70…

MALICIOUS

PDF

93.3 KB Created: 2021-10-04 12:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f2f53a876d35b34c5cac346b3b23345 SHA-1: 79e1123e8afae6bf4aae49a2a6e5164e77470e9b SHA-256: fbdf0a20a430cb709b93b194c4fd4f1c0dfc0a8e3defc30651d685fabcbec7f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=automated+budget+spreadsheet PDF link annotation
    • https://commonwealthsportsawards.com/userfiles/file/rulevewigebusulenutika.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/25848117193.pdfIn PDF document text
    • http://fabtur.ru/upload/files/wesekiwerusadirufido.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/97491264208.pdfIn PDF document text
    • http://aedjtj.pretty-match.com/upload/files/zibupitasit.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16157fb1860173---59234875134.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/91509940338.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/bekakagoriloruvegiwot.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912145834551941.pdfIn PDF document text
    • http://lj-group.cn/upload/files/fonexej.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/vugefevesax.pdfIn PDF document text
    • http://symbolfoods.com/files/file///55605940634.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/17924739637.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/tuzariwumix.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e288271eb4---71459735401.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/64563946070.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25262981370.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/58495011804.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/vuxawerimaxotot.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/posubutofuguxozovejaw.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2aee5e5e0f71b6534f98a92ce908ab12/17254792473.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142f1c3a5296---80164959403.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/0c3cc2680cb7679f8f3e86d376b0af99/zexuzudunakewexolojek.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/18189482245.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_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 21456 bytes
SHA-256: c52a971d4459802a301f5e55b28362bf7963be0b07b1b9670c4fda879bfe396e
font_01_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 10820 bytes
SHA-256: d6c5414a7fcc2019706dd3ae7e655ce08997e806b533afe51148584851d703f4
font_02_sfnt_off00014f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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