Malicious PDF — malware analysis report

Static analysis result for SHA-256 732157f5bad4c9b4…

MALICIOUS

PDF

93.5 KB Created: 2021-06-30 07:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67342e080554aeed3522776a209b90d1 SHA-1: c846d8429e7f4696b3bd3a2b60ea7a8bf81ad530 SHA-256: 732157f5bad4c9b418a6f83ac5ca265c07656b31798437ef68adb59a18d2ca52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0f12b618---kunesuvitat.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899f2a51c82---98287618178.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebac1bf66---welujewuvu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/23b25ab8d9bbd771f4a23000455ded2b/josexafulebizadosunat.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/93138779661.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bv8uk9l79a1jok16f65t8a8b94/48171627713.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d00c365ef81---pugaxevanikibexubajexa.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/waxodamidedexagudaka.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/jigugavelajolamumonagosev.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/7315318700.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/14607209423.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee908e484---42670122123.pdfIn PDF document text
    • http://darec.sk/files/files/todose.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/46051885328.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/gesupajagepemezemimafe.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/pkujmcs3duip52uvsndepq6ram/jutajulawewijinumonuv.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a5c3e785---fodabuzizomakejutufogame.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712c98f3612---panawodob.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/74271899107.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22f6bc1df---62339605991.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/20380304067.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077b517d8839---befaxirigiriguxavetej.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210530215534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=operating+systems+design+and+implementation+solutions+manualPDF 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_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 17868 bytes
SHA-256: c71796b46fff97b55fc1dcf22bcc779d3293d93e9ca7cf5e76a59009bb53f026
font_01_sfnt_off000136b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B0 10976 bytes
SHA-256: 6d1825ffb87c0462883e10ace6b416ed4d77b79c1ce9b99d9f4d406e8e175862
font_02_sfnt_off00014ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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