Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd9a413c10e0896…

MALICIOUS

PDF

120.6 KB Created: 2021-08-25 08:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9eb2b4e90373455974b02451b8a08e1a SHA-1: 781fcf3f806bf5d0b808c119005f34952278588e SHA-256: 6bd9a413c10e08965493755195d1cbee7ca98f306c9f2f798906283962779dad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains flagged as part of a link farm on potentially compromised hosting. The presence of embedded JavaScript, combined with the link farm heuristic, suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://isisthailand.org/file_media/file_image/file/fegubufafobiximenoxetep.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608929071a546---68888181444.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/67189633384.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/kotidemaxovufazem.pdfIn PDF document text
    • https://ivanamihic.com//files/31500878986.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/nadimevivosuviv.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/go2mdpm868diolilegogkq760s/vulazetonek.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/49191719969.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/33122766112.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/41705938452.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/44190033140.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/wusamezilebonidov.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/20094800336.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf25fc327ea---nezesokatutelorabim.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/94823350758.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/81306524064.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b06161001---82557367906.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tm82i62ker4jb52tvq035bkh3c/wajezurimawusilafojelo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/50393150571.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/flg120c5plqds47kk650np0qu0/16348941598.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/tebumepirasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=adaptation+of+penguin+for+class+7PDF 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_off00017044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17044 19972 bytes
SHA-256: 6bd0fa32af9c1b88c84c11ced946a772c660f8a07c79dec976a081cb07d3cb95
font_01_sfnt_off0001a37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A37C 10924 bytes
SHA-256: f90bf37309a274cce334effe3f902799b846360b098e1b777252e2a22d75e09f
font_02_sfnt_off0001bcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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