Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fb4a7cc84421a8…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 16:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 786b63c9b7bc3dc886fafcc00e919568 SHA-1: 9821d28182fc178f7d0bbbbde38baa9b18d267fe SHA-256: e7fb4a7cc84421a81ea290b50c36efcd45e89c73f9fcbd1ee33d98fcc5deef30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, serving as a lure to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://irlanc.ru/uplcv?utm_term=where+is+area+code+725
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/93b9f268c34b76ed6b7e8186c98a3a9e/60886930141.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096f96e5cc63---25073170867.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/topvvse5kg072ikr7av723vd73/24256029392.pdf
    • http://viajesalaos.com/webroot/img/files/xadotanuru.pdf
    • http://arci-mp.fr/admin/File/32860637677.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62ec232c4---safonebupepaw.pdf
    • http://onlineexpert.in/userfiles/file/sawamozivazomage.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607205dbb9291---talob.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac9231f99---30116053306.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/83e4dc4ea2b6117481fdc62d5cc9b78a/modafosela.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ecb85bc54---warozuminosoruxemel.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/48ce3d14e51a14c31431308e6679031f/votuzunazopugupidoluxe.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9761cc12f---39786944023.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/dkvoj0vn6ia1sk6tp1nfo35mfa/15440173787.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7342a58762---44387203096.pdf
    • https://avgdesign.com/userfiles/file/fafape.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/dalifadevol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 16792 bytes
font_01_sfnt_off0000f800.bin
1a88edb76405aa139df2590f09e82b05d8fe249f32632b8bf42e78adea4f1370		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 19696 bytes
font_02_sfnt_off00012a7e.bin
377a597bc0b7280a573381a0a0aee1fe17916e37ccc7ef6014b7d11cffb789bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 10516 bytes

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