Malicious PDF — malware analysis report

Static analysis result for SHA-256 679dc6c5c19d1224…

MALICIOUS

PDF

80.7 KB Created: 2021-10-07 23:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a946b84259cf48793848a4eef84bb9db SHA-1: 981029a8f21db3dc80977718df700ca29d6a430a SHA-256: 679dc6c5c19d12248b3fe21c0d09457179e57abdb8298aa760c2b45909067d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=front+tooth+pain+from+grinding
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159618bc852b---mudamemonukutunito.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbee1c8955---79910140451.pdf
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/tisowuwenejiti.pdf
    • http://wedooverseas.com/userfiles/file/fagopegetopozolan.pdf
    • https://bomando.bomsolar.com/uploadfiles/files/miwonexetibasedibu.pdf
    • https://yaslibakicisi.net/userfiles/file/pusilaj.pdf
    • http://njboyuanchem.com/upload/files/96270875232.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/wumaxivediwemipogafoj.pdf
    • http://chi-kara.net/Upload/files/kerugafatizo.pdf
    • http://nordicwalkingturak.hu/_user/file/dadawedizojunavip.pdf
    • http://carrozzeriardue.it/userfiles/files/40504562813.pdf
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/mexetaxik.pdf
    • http://shipsupply.ru/userfiles/files/ponagufu.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/75778823194.pdf
    • http://seidels-mineralienwelt.de/images/uploaded/file/35473219206.pdf
    • http://elementsgogreen.com/userfiles/file/sufuteduzewoleselesudib.pdf
    • https://calendarsunrooms.com/userfiles/files/napaxumotesefuzoxemuzi.pdf
    • http://emeraldcovepartners.com/_data/images/file/89348021582.pdf
    • http://wedding-box100.com/uploads/files/202110051812407720.pdf
    • https://serviceservice.eu/userfiles/file/14294360340.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ef1ec010c6b86ee8f7d0fa02a13e76c5/resujaje.pdf
    • http://hoangnamjsc.com/upload/files/67369097009.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d892.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 16792 bytes
font_01_sfnt_off0000f0a4.bin
fc24a8643420676fe960a19ebf8d052c8210f4350c49afe628ac96aa5eea9835		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 17664 bytes
font_02_sfnt_off00011ddb.bin
643c49d6ef918c3fe42eff3d9375118f0dc0ac1d4a1fe4ef0a8bfadd7f8e331a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 10576 bytes

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