Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de3535aecdc846a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 09:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4a86a9753c248fc1f2f2ba8052c21ca6 SHA-1: 6569a328a68343bcbb65a0c145c0e5cca3fb7827 SHA-256: 0de3535aecdc846a8eca2aee3b701d5ca82328742757ab9e9bebfaf27ce65fdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of numerous external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=another+way+to+say+customer+satisfaction PDF link annotation
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23830774104.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/jamirabesi.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/d3d0rsmam7bbhk47ejforg4e1t/95175962985.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/xajalagonaf.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/99913640940.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/63458845164.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/dce1c5615dd8daf22b5a21e938165d1b/tuwurajeguxazitakenixuk.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/n3qtjoqucqevnl5fu3pnis7keh/rigunowenapekep.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609878fa24536---69062875296.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tidekexu.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/fejosibotexon.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/dolivizowe.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae66a6e407b---51599350112.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ded4152d0---saxawerizozelilanot.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/63251487810.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c187501db65---17941380895.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/241c867ae18225f5adcdfad482860a7e/palinomevikuvixuketewalop.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/43230910357.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/74035920885.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c20b0393a3---ralafi.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/13772079891.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/53239383068.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/77e3376bfb65be7e6ffa6e55a7927e20/44959870691.pdfIn PDF document text
    • http://angel-juicer.com/FileData/ckfinder/files/20210721_8EF1592D1A8A3D08.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/97576338169.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_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 17476 bytes
SHA-256: e32cc52fdf7c6a1fa60b47569f614cfd187ef01e885b35c4ca258fedeb02cb84
font_01_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 10836 bytes
SHA-256: 1553b39947d4e7a5d5f6c055a1a8a6329e94ff7c50bae475f41d8d6c62cf3721

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