Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc612fc952dda60…

MALICIOUS

PDF

63.6 KB Created: 2021-09-09 03:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4719f23678bac3122e3b654975d9824e SHA-1: 9a83f911044962bc8ed8d9d750dc550094a05794 SHA-256: 4fc612fc952dda603e768463178cd23a1831ba962d4e37433b787fa535618759
154 Risk Score

Malware Insights

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

The PDF file contains a link farm of URLs, many of which are hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, likely related to phishing or malware delivery. The embedded URLs and link farm structure are consistent with techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6468

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=ez+battery+reconditioning+pdf+free+download PDF link annotation
    • https://aquafilling.com/userfiles/file/84654824482.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/88469815945.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/wuweraselewifugifexeteru.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/51095657306.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394ef753e84---76623659953.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i1pm3ai7s72imspc0tmnkk4fj6/67402054659.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/larezuboxesibokusefetuda.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4c7baad9b022d433c4aadea4412e25c8/fabisafuxaterirake.pdfIn PDF document text
    • http://01host.ru/userfiles/files/misuzaxiwajogif.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/28504481245.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210908_100806.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/pudomigajikotajefepa.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/xobeberitofudaxidonosu.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/1148318487.pdfIn PDF document text
    • http://netflor.pl/upload/File/22400765960.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/vevazar.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/76007146429.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/rulonupizonuxi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/07ebf730c6b074cfe96e5261ab06a569/mizulamumerasopafixiw.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/vororuxor.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/12985402061.pdfIn PDF document text
    • https://coevent.ru/upload/files/bagidul.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeef16371c---nazumisowovolatut.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/kadetajakon.pdfIn PDF document text
    • http://dentistturkey.com/image/files/xoxutigore.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_FA928360AE5C4F9D.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fd3405gutt9qv9bd5dthi3qb72/50104897733.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 17004 bytes
SHA-256: 1fb9a9d64875a7146649dab24390c20be641280598952baceaaa0f6b385ef540