Malicious PDF — malware analysis report

Static analysis result for SHA-256 becf39c691c7c935…

MALICIOUS

PDF

54.6 KB Created: 2021-09-27 07:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ca3a311c0fd78b64c51db8850a1c380d SHA-1: be93243b5cbb19e08d9f925116f23119e77fa6fe SHA-256: becf39c691c7c9353a39c1426405b141f23d93c694443a9c6b2cb3bded7e179d
162 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely for phishing or malware delivery. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8355

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://peoplesmodelinternational.com/ckfinder/userfiles/files/24027536413.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08c54e5a3---wibedam.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/15821164036.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210921235532.pdfIn PDF document text
    • http://tid.vn/upload/files/ripuvamirixunelamudevax.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1405f4dc0ad31c10706dac016690695f/69680222361.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/75845461137.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/14358351492.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/93608896566.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/99835883177.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/gajeg.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/221d30c1108c0e7781afd6eb1d0ff04e/79164358077.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/wujudogero.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/suwadugewakadamipibowo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b39f69d886---14733370821.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/namunodunadevatosewo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee1dc5468a---kijuxakajad.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/fusupu.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/34191719148.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/lafubaguvi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a1f6d02cd2b8acb49a9ade8e299dcc8f/39996084147.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/vuderaxixuwinoz.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284f773acf---runimexasexer.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/7142839799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tokyo+ghoul+manga+pdfPDF link annotation
    • 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_off0000be48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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