Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2237652aed34272…

MALICIOUS

PDF

83.5 KB Created: 2021-08-17 06:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5662f28b3d7174133501f12447cc022 SHA-1: 894c82897a5c264a88dfd81ef2f115bfc6d62034 SHA-256: f2237652aed34272b7f488ec798d457276143213a650fcdf64eea64678a98a8b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, with several pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The primary attack pattern involves leveraging a compromised document to distribute links to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://aunay-sous-auneau.fr/ckfinder/userfiles/files/sunosomide.pdf In PDF document text
    • http://iscyber.com/userfiles/files/rubogola.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c1e210ec1153c6db9d7322778d06d0a5/82888031869.pdfIn PDF document text
    • https://harom.ro/files/file/74066370464.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20bad2335a---64236149423.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/rujenivajoxiloro.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/092ccbd96cfb9e17b39b594292ec4fe5/rogurawubilawusatuxo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748f91b7558---8605826511.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/76d82456a890d1ed288794a9f4daaf33/72197998860.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160718ad88e32c---lurodisovigew.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/voposoxi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd93d66c279---66174417315.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/34987478685.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eaece214e---43445813904.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608947cb177d1---jugojedupivezovipis.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebe55910ff---4604688691.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/65262243262.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/futiz.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74536e896d---maxeva.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/86554398953.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f9bb0bce7---58840221092.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ut0kalesgdgrp3dv517itp1tb3/92115062217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fortalecimiento+de+la+comprension+lectora+cuarto+grado+de+primaria+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_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 17452 bytes
SHA-256: 0a9a7e75ce10f17de22ebe0cba98b18977c745a09f4e1d7f0e80557ce1364c7c
font_02_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 11040 bytes
SHA-256: ed593aaec21c8dfe922ef66f01f01ad54223c38f3b54cb351a7372a25d04eb80

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