Malicious PDF — malware analysis report

Static analysis result for SHA-256 96fd750d2969ed9a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 20:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a84e6fa3510dbcb7d88da99a55b99ea4 SHA-1: 0dd9fa04f6bff5b05f92ad64e8d2c60f0167c84e SHA-256: 96fd750d2969ed9adb46110448927318e9cd5958681e9277356099aaacc193f4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=kenmore+mini+fridge+repair+manual PDF link annotation
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772dc64d2bd---7674383443.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/juzuxibu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/163ba8fd09cf2d69d7c0ef23b29664ed/56187818991.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/jitafufiwu.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/jusibab.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/gk157ag7cjgcpb033043704nh4/kafon.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/xomavopazifuzef.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/39948630314.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7a83f1c7e8e8a05d16563d94e794839e/33832748266.pdfIn PDF document text
    • https://nicosiacaffe.it/file/62353614072.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/26f6166e3391ea2d8b42b61a5c73bf21/siwurebu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/tarpkb601j9uamp3uhg6ffruat/dezulipi.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/29457297503.pdfIn PDF document text
    • https://phuquiland.com/upload/files/19105094636.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/7106167423.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/93064056364.pdfIn PDF document text
    • https://securitydm.com/slicice/file/rujekijukut.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/idhjh2s5pi62efde1jpe5m7h6i/62505092877.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1c3a38142---83369973847.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf4f8b977a---xusazowuvufon.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/sapudawika.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fum84oam23p4j46dvhruku6hlp/86987672731.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/xokotolegizekopaguvuma.pdfIn PDF document text
    • https://suncables.co/images/file/81706080368.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_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 10668 bytes
SHA-256: 7a72850cfa22d88a3484b5ef292c47bd49f7f09fdfe7e5935a3ba54b3de23d6a
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 17820 bytes
SHA-256: 79e92cbf9cdab77c3b60004dab99e4c888a1c565ec3cee88e9f8545787ca121a
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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