Malicious PDF — malware analysis report

Static analysis result for SHA-256 d586e4e9432d5faa…

MALICIOUS

PDF

73.9 KB Created: 2021-08-28 07:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4946613d4e7dd8d8393f77822257e53 SHA-1: 564d5accade32bde46a8f903693b40fcd30c99ee SHA-256: d586e4e9432d5faa58b6ad53b56c9abc3ab6c50b1de919e822e3f0d4e0ca71cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised WordPress uploads or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly support its malicious nature.

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://perechen-jurnalov.ru/js/ckfinder/userfiles/files/12347557728.pdf In PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/19392128092.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7mfbtucem3ib5pdm0f8a1cb7r2/lobawarutak.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/97197808264.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/01f2f594b0e323e444aee343336610ac/dikedavevag.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/84910e7cec07c940d822e9e453d3129d/62703270694.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/nuxezopubekovewetiva.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/49327178526.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/kerurigubakufa.pdfIn PDF document text
    • https://blv.by/upload/editor/files/vajeferoxevuguw.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/62912315404.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/vabajo.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/foxufadowugumasopixupuseg.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/soxijarijefu.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/sexoposusixeta.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e10eb63ce---pageridega.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/63657828014.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/potewodivetetudi.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/76998562366.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/xelogerukoge.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160baa2ccb6ce6---88006617780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gpa+scale+reporting+weightedPDF 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_off0000bed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED5 10920 bytes
SHA-256: 9144f5774a37c58e07e731660d8c3c089e426371c6f9e0eac793d63b721a4fb7
font_01_sfnt_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 16188 bytes
SHA-256: ed45606375b4bb6fc0b9f4644c27da15d326fb9160ca98c15bb82cbff8403eab

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