Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d09c11bc46d6193…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 23:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: be4479730ad4cd83a72a12b6f2216052 SHA-1: 07354dd60fc8d9de098e274078f874a0cf642f55 SHA-256: 8d09c11bc46d61931c55673a5b5eb783e6c7117dbcc676e27f5323fe9a6df9e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://box8websites.com/ckfinder/userfiles/files/81555312964.pdf In PDF document text
    • https://joebalogh.ro/imagini_ws/zabexukade.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/vepetesun.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/90206527262.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138b178d2451---dukin.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/gapexiziwew.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/90927098983.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/tupijotinubakafoboranomem.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/wadidevidozadixuwegis.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/40485208974.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/350603_73212604505.pdfIn PDF document text
    • http://pvvc.cz/files/72670916880.pdfIn PDF document text
    • http://xhzhengli.com/upload/motujegaxonirifevoponu.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/59720682849.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/ladon.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/34852569907.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161353880cf364---piruvelasokaw.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50832792207.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/22911152854.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613321639e943---kuwane.pdfIn PDF document text
    • http://rnralpha.cz/res/file/96621550945.pdfIn PDF document text
    • http://elskenecologie.nl/files/11042874969.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161349532d2bc6---dagudulerezepowit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+10+multiple+usersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32F 18216 bytes
SHA-256: 5d8ffaa1d5a6a2b695d9e6e862105b9f8088dc83ee3d5b5bc4b103951f9cd2ac
font_01_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 10644 bytes
SHA-256: 5ab424de3917a22e32a019fd57e918914d35c93e80c71cb964b5734afebfaa1b

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