Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bbcc8a940ff7a0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 16:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d38045a0a349d9f56f7046b95ad42985 SHA-1: 87939a79fd792ae6d5f00e1b83a8b613a38b2773 SHA-256: e9bbcc8a940ff7a0c3e249be6a8eb131f586a3a81b9ec87d7c46cb63c6ed7122
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to these external links, which are designed to lure users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://wastran.ru/uplcv?utm_term=things+with+letter+r PDF link annotation
    • http://bn-biz.com/userData/board/file/88799198528.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/xuwekafizozafotorinumixe.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/68338717281.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/cf5f922b78bee626c6720d1dc0985efc/22654273338.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/kodopijatasadolovit.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/16612874754.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/19149884893.pdfIn PDF document text
    • http://generaldistco.com/images/file/28982696309.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/73901627055.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/titibavokalola.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/40588837362.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/20710597244.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t3iv97jppp1g715mc81f1il9d3/15271538704.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/82320264927.pdfIn PDF document text
    • https://bfull.ru/uploads/files/sizipatarokoz.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/3153962446.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/33222572205.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/pikigifesal.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614074de1072a---vudulisosegufulesiri.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/dokanasuludike.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/1965867709.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/18413313524.pdfIn PDF document text
    • http://synfarm.com/upload/files/sasebepetatalapadetupawe.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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 17652 bytes
SHA-256: 9f861bef0d1b33a2d3d56792f8e051035cfc9b63af3d46f4224d03ad3e9589dc
font_02_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 10152 bytes
SHA-256: a783c8d93898dbc98584ad0b4c15dcb9a569a6d9a663da094fed1e9f9ece76e6

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