Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f70eda4e771b12…

MALICIOUS

PDF

89.3 KB Created: 2021-09-03 03:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24cd287a1a17ecfe5f8d043b23b1b800 SHA-1: 6f3fc550257d06525ebf43fa9abbaa8cdcc1066d SHA-256: 82f70eda4e771b12dae6a7f73794400ff0d48d2ae72986a45c8ade0ba9151a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=essential+haematology+7th+edition+pdf+free+download PDF link annotation
    • http://debschoen.com/userfiles/file/pagamuvonidojuxofanapumut.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/24784499295.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/jebomanuxezilapuzadeka.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/rk0tvnb426qtgq6m72opr6o8j0/wapinozuponituna.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/5250851073.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160713d0a6ef6b---10396192858.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b7baa461---57228401988.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/75666968982.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/misutadiwamevawutalo.pdfIn PDF document text
    • https://mfdesign.hu/files/file/vovuzigojerovudeno.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/veminonovuvotovare.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085903624be1---37012752445.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0695e9e4f7---22706240116.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/jonakebozuxajovumawimu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075a28006d13---28625118715.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d03b35a3b---62460466545.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/llv84mrlpt5g9p9dmlm7bdmro5/bizobiminixi.pdfIn PDF document text
    • http://metabolit.ru/files/file/kolora.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/383nps0d7m5umug6ho6hg1i1s2/kefolonugikasatuwizuvi.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200791827978.pdfIn PDF document text
    • https://area5srl.it/file/firojimiselonaw.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_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 19172 bytes
SHA-256: ce8a6e8b1a569e060ece66f28ee950b4d5b69101774090dd3d6772c695380708
font_02_sfnt_off00013de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE2 11176 bytes
SHA-256: 1a480e75f08bf9c76cb12a1f7f2ce74faf5a3613a6197f8f7dcca7cdc6c31480

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