Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee65b20444eba5f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 13:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 226f14b01a19db758006359676dfd83a SHA-1: b8b24c6c8ea874627bb1d3ccdb763fb22d2a3d32 SHA-256: 7ee65b20444eba5f150d58a9f2099b831cd6d8ed78aa1a20dc2dc1e6a4d9211d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links are designed to lure users to these compromised hosts, which may serve as landing pages for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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 https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/u6ibl7of3296o361bd0s8n8j27/kufofojugetarone.pdf In PDF document text
    • http://omatsuri.kr/data/userfiles/files/badenakoduvaza.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/xatimotiw.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/popovetuwanatigibuvabe.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/54904930408.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f69acd73b---86046221362.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/80417941052.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6986569f67---lopemiwanuvexi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b220fccda5---rokixijoxijovuvedam.pdfIn PDF document text
    • http://short-story.ru/upload/file/76880606883.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/81eb1fea5e8901074d1c3adbf04e574d/472100107.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161297df217899---tuzilujafalaza.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/lawoda.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec417feeb92---duwalatizede.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/2994236466.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/vebidutazubi.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/770d73uvmr1ckacn9nkdftdvm0/37522181731.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/73abf881ba718aef1e6e253e09de370f/49210833275.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec424b4b80c---xinezak.pdfIn PDF document text
    • https://cncunse.com/d/files/dadikanolegegus.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210616021317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=english+file+upper+intermediate+answer+key+pdfPDF 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_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 16888 bytes
SHA-256: 82ae27d3e0d1ec6db7e69e679f4d5859b56d696a9d03455dde55b1af22e8b3e1
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 11200 bytes
SHA-256: 10ae47ffe82b5aa264f9e884244a3d2da597a7c6021addc353d1ee9f246113f9
font_02_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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