Malicious PDF — malware analysis report

Static analysis result for SHA-256 682509397721c80d…

MALICIOUS

PDF

67.9 KB Created: 2021-09-16 22:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d094e4df881967b68de3f850fcced984 SHA-1: b7fbb9ecfbcb2325db1dc9ed2aebf3ee02809d6c SHA-256: 682509397721c80d602419fc4612ffd60033dbb21c58a6823b45dd724e91a457
162 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or to download a second-stage payload. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7740

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://catamma.ru/uplcv?utm_term=aging+society+and+the+life+course PDF link annotation
    • http://rioairporttransfer.com/ckfinder/userfiles/files/medijaludikebajaropos.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18095908399.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161409583920b1---rurisumup.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/rolefabibapinelumonaxoj.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/rasad.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613030e712a87---fapixogetakiput.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/32345110833.pdfIn PDF document text
    • http://kodemari.info/data/files/33397338232.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/67438787573.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/981463c5de23902c76f7a3fe1cdc6a97/55776876868.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf921e40f---270532145.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/26919818340.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/17q662npevv7sjtp8cfi1csqh6/noxemikezakilumagu.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/71932001224.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/dexemoxulakidusolate.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/risodejo.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/99782278932.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/kireligijeropupemamerofur.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a4bc9c77---42730689296.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/98468714074.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/jafal.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/wunozikobapejibetidis.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_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 19204 bytes
SHA-256: 831059845ee9a6c44d534280488facccecf79dcb1921e8da6e081c66de61c897

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