Malicious PDF — malware analysis report

Static analysis result for SHA-256 420ea0a1e0d92f67…

MALICIOUS

PDF

67.2 KB Created: 2021-06-11 11:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3849605a8bcb11fd46cbf91b3fb3ab6 SHA-1: 49255a830e1142bb7d5d9b6a0755f66db1cae70c SHA-256: 420ea0a1e0d92f67033e60cab7c0e0b776d0a2f809ccfe1cd3b4218e07da9b82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, using a link farm to direct users to potentially malicious content under the guise of providing comic downloads. The presence of numerous URLs pointing to compromised WordPress sites and disposable hosting, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to facilitate the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=velamma+comics+pdf+download
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ad47ada7---gorupuw.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7e772a12e9---8749540351.pdf
    • https://tenfci.org/userfiles/file/79056684392.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967e0b9b8cd---13416951426.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903294b1454---43495151308.pdf
    • https://biocoils.com/img/file/wegevav.pdf
    • http://acpiindia.com/userfiles/file/sewepigugodipaz.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948071370c3---89492266095.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e42054e4e---29794980266.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c81b3b645---85445056527.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f5e3c185---50892446025.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d73e0a0cb---29352499280.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160841ed1f0085---pojawalibotejanal.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/g4agn1hqssv919a8kbdanuc330/nadajufalevoniro.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/t2c7gam3938mbl2oguph89fma0/58661611605.pdf
    • https://gw21.ch/uploads/userfiles/file/6590311785.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/6914667220.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2032c42aab---benebuma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca0d.bin
e66492c3d9ffbe7514929b26bcfcb79109554044f4faff464755f08625383a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 5260 bytes
font_01_sfnt_off0000dbfd.bin
7c4ac18687ef99a47efb60d8caedbe13d2b5a6b907291e8eb001366520f6ce43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 10316 bytes

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