Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4d72eb071066e4…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 22:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 52cc6a66baeff67b519c85cf569ebec8 SHA-1: 8d439c82e93dd7b07558e5ff78ac699b0e6c3fc4 SHA-256: bb4d72eb071066e4e3a49ddeca530cee8d2eca70189a9b9ad8f4e55f95373532
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The document body is heavily obfuscated, but the presence of external URIs and link farm indicators suggests an attempt to redirect users to potentially malicious content or phishing sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=photoshop+text+on+path PDF link annotation
    • https://eko-briketes.lv/userfiles/files/586334963.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149959c9fc37---gizak.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/19034035718.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/92372969148.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/zaboxo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa3e11c724---39660817935.pdfIn PDF document text
    • http://altus.pl/userfiles/file/pavizovodepogezakinivi.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/10269972685.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/kivos.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/44110802551.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/rosirixivekujutewowot.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/rijunubimo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a46c95146---94265283647.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/gakeronagovawudivil.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142578af3181---dadijaresavi.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/vodoweketamerireleda.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/35486334395.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/67349928006.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/makodum.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/modufedo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ad4cd97da---39836639252.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_off0000b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 10216 bytes
SHA-256: 2418e6e82f72f7ef0515dadb3c9a079ff30f5aacc7194d565fa164a4645df72f
font_01_sfnt_off0000c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 17152 bytes
SHA-256: 8411acdd5ce32df992ed22e0cbcaa166562b34c56160d74abd5ac7360577067b
font_02_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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