Malicious PDF — malware analysis report

Static analysis result for SHA-256 042d95d4d0a248c6…

MALICIOUS

PDF

97.7 KB Created: 2021-08-15 03:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68edd5b5b1fddb9540e70eca78140bb2 SHA-1: 57284ea6e0cfd801d90c3b2e81dceb1290a0e519 SHA-256: 042d95d4d0a248c6979591c03bb92312f433c3450b429bd14b3a0e6e6f604c2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and the nature of the heuristics strongly suggest this document is designed to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=trane+xl90+furnace+specs PDF link annotation
    • http://aroma--style.net/files/files/36745054666.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/72528313896.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/nin94c4ud6sgopkir4sooktva5/jovajulodafefowumugi.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/10559401444.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a52a45520---18850153813.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/94933005184.pdfIn PDF document text
    • https://coil.hk/upload/files/vewegubezelopuk.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaa577a950---44886199688.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/11f92fe1184b3c93141e404d4b283efb/tumixivubili.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/72136529855.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/90317262490.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/88796458447.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/88209279065.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/xomizuz.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/32716820661.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63956ca89e---32790874416.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/52542164736.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082446d104cd---boveb.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e66c595b7---348684118.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/e7665353517f4d3a8b337fb9292082d1/79210921196.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1aeea119e2---bagukupofufubeb.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c38bcd5bac01e81c2a737bfd4c2d0d93/97239732917.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/27293184969.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/67630766166f8cdaccc4a07e890055c7/58044370900.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a063e94c4---53415066630.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_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 10620 bytes
SHA-256: 7d1ebd56c789ba67eab7b92d5d8d617a21aa25a6c31f5578b15e3ca66c41fcc5
font_01_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14623 18576 bytes
SHA-256: f3dda8466c714f923629fa08c722f62cd9932eb407c6c9e479b960138e300064

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