Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23b212eec56aba3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 21:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f89019816fca43afd66c42ab20bbe553 SHA-1: a7f127da530dfaa1bfe7c89382c6853c5b03b1c3 SHA-256: d23b212eec56aba3ef22df8e7a6d886356d5e16c39b1cbb010fb8806bbf7150a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, and are disguised as a 'free generator' for in-game currency. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a secondary payload. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a lure for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=free+generator+v+bucks PDF link annotation
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/00106a4e1dbbf44ea9f2944d8307b631/bafemixewaxavalosifudilu.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/wugivu.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/nasuga.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/robixojiranawakib.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/tixifova.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139323438a03---tenenaneso.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/vevivetagilelagewonavu.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/zizixa.pdfIn PDF document text
    • http://boldogelet.hu/media/gilewijifekewexujexapisax.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109070618427196.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/17c73bffbfbfa6281e033d1f1f964a1e/84461468187.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/vuvamemij.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ir2u3j801aa688v1etfoicql28/63702970376.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/golojiva.pdfIn PDF document text
    • https://datajournonepal.org/files/22816742295.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/87381131445.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/55266667843.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/54360496109.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/3010713369.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/moradaxufuzovirujomumomo.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109271657596744.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/22718492127.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/97622708322.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f53865a6---menogedukalitapomux.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_off0000b2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A3 15928 bytes
SHA-256: a7f8396e87b1e3590e28665319b11bc1a3dce117c3086ba2a2e6302e586eb3c7
font_01_sfnt_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10644 bytes
SHA-256: f66bc1239a490bca93ba36fa1658c04db672e4b949186413c6b5360ac0e541ed

Open this report in the interactive analyzer, or submit your own file for analysis.