Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf967e62584f8e3…

MALICIOUS

PDF

75.0 KB Created: 2021-08-16 18:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83e7c1cd8cfbe76ded3aa4e67a1fc730 SHA-1: cad520cd721adbaed49a2844c7af9b64306025a6 SHA-256: 9cf967e62584f8e346380668704a71755af60693563a08cc5ad982d0de403958
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://project-st.ru/userfiles/file/81151244671.pdf In PDF document text
    • http://thuocnam.xyz/images/files/46094153697.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/tixuximawewika.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dupofusobetasijujipozufo.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/wasipezoweba.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/79119938736.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/11896441586.pdfIn PDF document text
    • https://robertbah.si/files/file/xajokapopifuwitimoxafem.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/45005995572.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/87379999432.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/8342990713.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/753tisfuur8410moq7qt5g5u76/nepobafasifumusapixoduxim.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/7288d07fe2391a139d883198f87062ba/91991449084.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098b811d752b---77946932675.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/3449530623.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607307641a631---33180286870.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/janepamarewi.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/mabezu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/53d6c55dd76977294d7f10022ddc9c40/xaduzijaviwemu.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/56503501375.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/43996668277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=libro+de+formacion+y+orientacion+laboral+grado+superior+pdfPDF 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_off0000bd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD574 17196 bytes
SHA-256: be5ec3e21dbed62b94c5b1c444ab85418d8d8d8c5a78a13ee78ebc47c1cb6a71
font_02_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 11272 bytes
SHA-256: f26ef6133d72379c89967dd0efc3ede7a06c670c5245a37e132122e0975b5152

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