Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a2f5aef0eb9673…

MALICIOUS

PDF

94.2 KB Created: 2021-07-31 14:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6633b0f8a8f427cbbc0714bf7361aa51 SHA-1: 33e9955214ef9c370c7905ef957ca63a339b7cc7 SHA-256: b9a2f5aef0eb967326877d0023db5fc807cb68c3095716ed970c25f059a65d51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://aftckwt.com/uploads/file/kurejumokusojiza.pdf In PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/jumuvalazigobegol.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/gokebof.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608120787efa5---vexiwa.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/65101114982.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/kavetatekejurujubowoxu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c188b61ea3452d7f18fe701bca2b4f98/fosidireb.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/kibovepazupuxorosovitaw.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/ruzamefevemipotonijodib.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adff6559511---gogopowurepaworuvoweso.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bad57617da4---jekizirinivubutusotumaruk.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/lavuremalapovezupifol.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/75111329479.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4207c15dbf---nobepuduropurowi.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/fdf128b3fb7bbede1800b82492da35b2/pozegosuvov.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/47677722202.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/liwivonunarabafojakotuwoz.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/45672497386.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/96180534497.pdfIn PDF document text
    • http://lucann.com/Upload/file/76371018593.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/vawamukerezar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+be+a+christian+without+being+religious+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5e47fb25---8894274271.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_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 19352 bytes
SHA-256: 9535f5ec03e2674fc7a122740d21810018021aeedfdbad241364e6bc1e5556aa
font_01_sfnt_off00013824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13824 11216 bytes
SHA-256: 7c006560247296ca633d8539eda1ef65fa96d8601468c743ecbd01bda33a79c9
font_02_sfnt_off000151f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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