Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bb307ff7b0d46e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 05:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 344cfb48bad061ce0570b7242e19ee51 SHA-1: 7ea0257c79f32b3984436405e98fdb0d6514266c SHA-256: e4bb307ff7b0d46e7c5558f95f368ed548329f6d7977335060a86b6e76ec187f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=how+to+change+clock+android PDF link annotation
    • http://skolicka.eu/foto/images/file/67528360819.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131889c6b2d7---53324185189.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/68419507245.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/fewulowoxoxodibaxibefiru.pdfIn PDF document text
    • http://kite-surf.sk/files/monejulopetezirile.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/nezuboxizoxo.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/gudeka.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/22951536929.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/18177216927.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/41995317620.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/4431622703.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/20588264880.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/kefipebiji.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3b451f66d2983ac52f4e562e2107676c/sutorigetezunebosexaxok.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3032402678.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/48604536942.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/17742140146.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/60141292893.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/sozakibinivubosul.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/11089981954.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403cc6e07d0---68942540952.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/juwolesuwibixawifeja.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/xupuzefikadinija.pdfIn PDF document text
    • https://parc-hotel.info/file/80320702059.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/16952087997.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_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 17536 bytes
SHA-256: 80eed30109895e71c66c801f4a9ce57dd65a2cb1fd148b584e09438d96a6dd15
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 10648 bytes
SHA-256: 35cc4422ff7213d62f625a71b7ade7c8919ed96d90d4ccba9ca4eaa4087f020a

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