Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5da20c69233ec5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 05:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3738a67640105d0597bb33ef19c112f SHA-1: 1a796f320f89bc168d45521abbaa4ad5f824ef09 SHA-256: ce5da20c69233ec5b17aef830ba09d0b22e524ed017a06ae07de026ff84af781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://kayapaliinsaat.net/file/79391309818.pdf In PDF document text
    • http://esoftland.com/userfiles/file/tajuv.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/81863268683.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b4fc6a2428890c867df94c07cd2da4a3/71589485694.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/24703384592.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/2982808238.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/wetebogarozidovefubu.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/74055309437.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135bda23ec46---34848604498.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/dugodotegimu.pdfIn PDF document text
    • http://co-mit.com/uploads/files/tititoxa.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/18329131395.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/tuwofubemejujutes.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/3512033836.pdfIn PDF document text
    • https://novsport.com/content/File/kuzadarek.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f87bfbae---63826206342.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/leromoxipemilikuxagus.pdfIn PDF document text
    • http://hydrem.ru/images/file/88178496326.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/94516808385.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/31672586619.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/59949569496.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323c144e75b---99230960434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fast+and+furious+5+film+full+moviePDF link annotation
    • 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_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 16416 bytes
SHA-256: 81d0c72d052bf72be02ef811b32908bf3a1a01bdaed61ca7b0bc71e874abff69
font_01_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 10792 bytes
SHA-256: f5b3c297b6c767c474411cd8211b49a3df6392ba2d8f46b99837b5f12a8f92f1