Malicious PDF — malware analysis report

Static analysis result for SHA-256 caea5684185faa17…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 08:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 722086a5a625c9d5b2520247a676b299 SHA-1: d2cffa922cc6bf8cb8b0e996ccb0e2323fe53e3d SHA-256: caea5684185faa179bdfa0af5967149ee34b8d8503ed9cf52f60901cbfb1554b
154 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external PDF files hosted on various domains. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6680

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://hogozaty.com/ckfinder/userfiles/files/xajudipodufunubixorebu.pdf In PDF document text
    • http://piqiso.ru/userfiles/file/53437577358.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e161214eded25e41aa95575c13cab5b2/luvel.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/milixupifuzejove.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/50850226331.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/54531771477.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/wetopetilepesokefigubiko.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/63001653305.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/tidususexulojefijoke.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/telapazujajopuxob.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76881078863.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/61702057913.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614550379f569---tajelemuzumosikofimibiba.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140455b1c349---61106867325.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/togazumevubovodi.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/juzuvijewotexuxogixo.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/polaja.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/81603660362.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/24349139592.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/doworul.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/24141286410.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/26386858810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fundamentals+of+biostatistics+7th+edition+solutions+manual+pdf+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 19232 bytes
SHA-256: 95c6981853f010ca4c53e10566743dd0db1eadf827d67dce6949d4df509a94b2
font_01_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 11152 bytes
SHA-256: db6cca7d9bf5cbbc3300c1489f92f06559e217c7a11e7e7782b23230f517c6b7