Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a7c772c9426f7f…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 02:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bf8d356fea2a528fca07b7900a8cfa4 SHA-1: fe0b587fc53785a8fcf5d2c6aa5fa6d429132edf SHA-256: d9a7c772c9426f7f26e8b4ce1f289ab3a6b762b8a3176504e3717496bf3e8597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware delivery. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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://infrive.ru/uplcv?utm_term=how+to+view+archived+messages+on+messenger+android
    • http://jeanchapleau.com/userfiles/file/puzuvubatafuxetaga.pdf
    • https://photojet.net/userfiles/file/fifejuwusafirenave.pdf
    • http://yuhao-tech.com/userfiles/file/13760041157.pdf
    • https://floridainvestment.cz/files/file/tovajowugumal.pdf
    • http://fc-junajted.com/upload/datoteke/vizuluxefogebu.pdf
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/11941353842.pdf
    • http://zygzak.eu/foto_dane/wysiwyg/File/difiviruvamota.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/6449226982.pdf
    • https://mallncart.com/userfiles/files/gusinutizov.pdf
    • https://cursosadistanciayonline.com/medios/files/lanalazulotoxizuzam.pdf
    • http://malir-naterac.info/UserFiles/File/1085931532.pdf
    • https://vinocastillo.hu/editor_up/84117009346.pdf
    • http://quangcaosms.org/media/ftp/file/23264251061.pdf
    • http://anhuifan.com/upload_fck/file/2021-9-5/20210905065234343619.pdf
    • http://ingenermarket.ru/userfiles/86219842539.pdf
    • https://melnikhouse.com/userfiles/file/72114416355.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161340eda55f79---lagurexagowol.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/27017836296.pdf
    • https://kiptep.ru/file/84588133923.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327b47d9f47---3905044052.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371dfce35d6---58339460803.pdf
    • http://www.armstrongre.com/files/files/zetawu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c29a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC29A 16792 bytes
font_01_sfnt_off0000dab1.bin
42d1b9f824e8c4b54e19d789b9ae7523208b0ca2b2c108e8bc505127dfcbf4f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 10916 bytes
font_02_sfnt_off0000f39c.bin
a3372ccd880fc00a4c8ca3d38e847a0bacda5ed5814c187e44c59b9e4b0f362b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 16760 bytes

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