Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb5f91550bd12b3…

MALICIOUS

PDF

70.7 KB Created: 2021-09-13 12:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4560b3e010284336489c8bf17a725379 SHA-1: 262bf9d022302a39d488d29728ef585cfabde375 SHA-256: 4eb5f91550bd12b31094a873ba2d7aad86d8b5768f1a38fe71c03327bfd64292
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://chinawin-consult.com/userfiles/fotijafelejilijexom.pdf In PDF document text
    • https://otterdisplay.com/userfiles/file/samudores.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/xigiron.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/45200606379.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/rizisexutoxaka.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/gerewifa.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/v00hi78pkjqgj03uprrc1fk4uo/wisokebugozava.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3e01c182---62875503015.pdfIn PDF document text
    • https://tcremich.lu/files/files/sujuworezakow.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d08735ad9---pujaki.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/55012028789.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/viloditol.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/29313039393.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/65143089351.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/85p7t4420h7itdf98j0jrmqgtg/sajadajadolizokowijal.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/xitujuwokuba.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/86638117943.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/xemedos.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/nomemomaperomerodimosine.pdfIn PDF document text
    • https://yodobashi-church.com/pebitugesiwusotinipeboset.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/dowazovisinemuz.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/verezokunijominul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+go+coins+hack+without+human+verificationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E9 16144 bytes
SHA-256: 7ef4ddbd8516fb14827c8cb448adb5c0824b9ca33c0bce6cd33283a2e6526bff
font_01_sfnt_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 11084 bytes
SHA-256: 76365914e8772cb38b39374027535bf0a4a92628c987e5463434aa625cda131e

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