Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a54a3a82e4f9ce8…

MALICIOUS

PDF

77.7 KB Created: 2021-07-23 04:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7399d59a42a3aac5422bde8b7acf58b8 SHA-1: c8aa4d71e3b94b803885c1221b9c3cd38d1d18b4 SHA-256: 4a54a3a82e4f9ce80b561b7819d19ff5f1df8fa88727abf914c05e3100b8be05
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160713c950d47a---61515548395.pdf In PDF document text
    • http://pensionpoint.cz/userfiles/files/82335968239.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082805b99062---jarogerotubivov.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddc50ded4---98914239555.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ecdfdd1d7b206f4087d0b5d444f04f7d/wugamojekawetazobiver.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xuduxumadazajulafobujus.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cghmnii5dng4h5ul0p8cfnhdi5/59088313257.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/52beb0f7309c3c637fc9855c2b4bb22a/dokotebafojetepowusakaxo.pdfIn PDF document text
    • http://ligneus.hu/upload/file/82067010683.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/4844534002.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23595c9b9---4349442269.pdfIn PDF document text
    • http://come2menorca.com/images/file/25052567988.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/midiac1ftqbhm8cshl6d6appuq/gavuvukapujuruzefinami.pdfIn PDF document text
    • http://svx.su/ffile/file/sejuxamisona.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/rotubemusujam.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d043ea80c9e---fofutose.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/rufoxuge.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31ec606d5---83812259287.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/67902595763.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/86065344063.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a039121429---62454217356.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c384410fbd0---34291687382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+to+ps+converter+onlinePDF 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_off0000ce2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2C 16588 bytes
SHA-256: be4e7397379b26f76276e80afaf68ffa58fc6e27e6911fd6b291dd27a514844b
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 10520 bytes
SHA-256: 149f7c19d42fd1d7c2ec99a624cf004b1c4b6b459923c1e2c6ff56a399062e2f

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