Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b1bc0f78a99f48…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 23:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddb13c95853857101d9c36bb72283baa SHA-1: 6bc279e688a3982c2286f4faee429f64b57c8759 SHA-256: d8b1bc0f78a99f48c8bdd2059c60bba6508a7b1a9b84d2f4bad8a8d60929b891
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to potentially compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of PDF link farm heuristics suggests an attempt to obscure the final malicious destination or to distribute payloads through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424fefea03f---92136468344.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614086801b0af---wuketipimupuwugutov.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/jamakemos.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/fusinumitufajebigavu.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/9169636976.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/rutiferubowegusagaviki.pdfIn PDF document text
    • http://insei.eu/userfiles/files/79094860243.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/mikodolidizijuzegirib.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/60652076769.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/rupifotinonixujeron.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613383e3f3b26---mukabaxovejizobolutef.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/lidojud.pdfIn PDF document text
    • https://cakkue.com/contents/files/22884234737.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f571c7505---ratamij.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/45792812930.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/zumex.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/51331921498.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/15418203318.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/58679491097.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-10/20210910204524868475.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5622d7264---62223673046.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161384ae465d6d---serexosugafelevovix.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/edd540312d95ec7e747768bd1883aacc/30318771364.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/82980146196.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/15640085827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=english+lesson+for+intermediate+level+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_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 17960 bytes
SHA-256: 51d22e6274737d592982b91e0f7bdee1a082b167021ac3b5861be8309e49efc3
font_01_sfnt_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 10992 bytes
SHA-256: b27d860ab37ad29fa1125465491f4008e1e0e60aaa9bc6fdadfe9dd9d918c914

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