Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22205fea80f384b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 04:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84f2386cef08ca6c8b37ff38238ba814 SHA-1: a1185369e56244411baec19239aebdd70ad77906 SHA-256: f22205fea80f384bfddb0f95f2dcbc0a0a87f7908816a8724f9c6bd08acbe9e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=guitar+christmas+sheet+music+pdf PDF link annotation
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7d4b779e5c9882dc914743598cc06492/5872576413.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/mu4ifh3hal4vfeonu7gotq6k52/87042963523.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/71572442362.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/dubeniwarumipejumele.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/vifalijegaxuxa.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/98182169915.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/19056786235.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97b0be2b8---gigezeganimuxetowejiwu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/19v9v5sbm312f8mvfeicurh8si/waxebedubarafibe.pdfIn PDF document text
    • https://new-baby.me/userfiles/file/molinezetuzezixebesozok.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/68451799511.pdfIn PDF document text
    • http://planetamama.ru/files/file/55287571287.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/peggilerc3d3vocn3l0sigfgj7/kemanotaxusu.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/99344100020.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/49955980670.pdfIn PDF document text
    • https://samtee.com/admin/images/file/nuvofovuma.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/53ebf0cfb2ca54313fc4c564b1aed23c/renilumabe.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f5acfae8ead---lavezakudakuf.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/goxubujatejitenodu.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/voguvixu.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/mewogosukajodonexowa.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2b875837e1fb416916c74cacf0b504c6/tupojufabazewomonur.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/83089892268.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/wewafobopuku.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/wigepirigobeviligijo.pdfIn PDF document text
    • 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_off0000b27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27E 10756 bytes
SHA-256: 451cb00392290eec78508def2eb9cc1f1e8976033f29f1970bae4a139bc2d9d4
font_01_sfnt_off0000cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 14624 bytes
SHA-256: 667f53ec5889f195244a86d5747eea6612bbd6300402c410a21340652978a15b
font_02_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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