Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b7b03e7c163e62…

MALICIOUS

PDF

67.9 KB Created: 2021-09-07 20:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53e0438db49131cb35b9ae2c2bcdde28 SHA-1: fddcdf64ecf7b3a1a9db3460cb5577dd1122e096 SHA-256: 93b7b03e7c163e62a4bb00e85eba4fa6de39a15d9e0bd4ee34a6a4101d37a652
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs pointing to compromised websites, suggesting a phishing or malware distribution attempt. The presence of a link farm on disposable hosting further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=basic+hardware+of+computer+system+pdf PDF link annotation
    • http://starrwindow.com/clients/863399/File/xivoxadelevojok.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b6c11078ca4.pdfIn PDF document text
    • http://coumert.com/images/file/52478891608.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/bibetuf.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/dazewuvozasowob.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/84790751524.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a334e213e---5516274787.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eafca13c5---dipulananokaj.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gadagikudom.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/bimutarisuwovimusi.pdfIn PDF document text
    • http://industrialdevices.in/uploads/43812122036.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/jepudodirol.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/042adeb39c59c4bbd0d97ab84f88cc1a/baxififorujaveli.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/36065109885.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/87734442466.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/dd711a8361816c6b35e9ac79ad5237e3/wimapojolate.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/foselozevewegomipewe.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/68461115662.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/34126953196.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/73747713337.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/wipafe.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/33256637190.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607264c4da002---zapusaxuda.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609602e52bd70---wadusimafatinumonajis.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_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16616 bytes
SHA-256: 9bf38aa3da0e5958efde1ee914fdf05eaf0b44fefbe14bf8941aacf53fe35f9e

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