Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebf21e67e00e621…

MALICIOUS

PDF

86.7 KB Created: 2021-09-14 01:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f9499c53a81f1eab7e27286e5eb244fe SHA-1: 13118b1e170cf9fed2bb188e81295082a2d13c60 SHA-256: cebf21e67e00e621920c25e89884dce6c17e182bb7ca58e7dd973764209bb7c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://engcaphone.com/_UploadFile/Images/file/dexometegof.pdf In PDF document text
    • http://shijijiaming.cn/filespath/files/20210902151654.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/68621363318.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/32669396584.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/zuzajobiburo.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/mokovizago.pdfIn PDF document text
    • http://orthodoxnews.us/file/tufagexamupul.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/gefibaz.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/cca5893a884d540ee1ac7047e995f92e/30002918378.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/79925913960.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/54296724562.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a66810a5cb---wejubade.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/zolal.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613172f8add65---fawesabaruna.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210903050644.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/2804551443.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/pawobasirovonuxukujaw.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/57592994292.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/90305490094.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210904131321.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/38765534047.pdfIn PDF document text
    • http://deauville.ru/files/file/87814565153.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/bafurukuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+watch+miraculous+ladybug+season+4+for+freePDF 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_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 11432 bytes
SHA-256: 1cc2de93b1405ff5d25ca82877a36199d1b681390d0134462ef8d39539d35e6b
font_01_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 17392 bytes
SHA-256: 4d17323e78063b35619e144146f98e70f52ff24a967931db0da2328404927fa7
font_02_sfnt_off000134ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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