Malicious PDF — malware analysis report

Static analysis result for SHA-256 04974c7543a24e94…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 21:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f79799a5416433527311da62f494656 SHA-1: da242c0777b216594c0300887876174b6db34df7 SHA-256: 04974c7543a24e94c94aff10e2e80159ed06a05f0f4a4921968d27ef7f933d20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://x-leather.com/radsportfiles/file/30308151921.pdf In PDF document text
    • http://izeninfo.net/admin/upload/files/11949147312.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/zimivowakedaxoro.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/7063809267.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090caa0e86e9---73942824564.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/lapozisetimozej.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f85622731ae---70784339240.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0e1e6989---924799167.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qr0t1vu7o1gkvinjgqq85e2ouj/zopibetasenesezubibaniw.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/rimezuvirotuwokifabex.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/suxigutawimolesizawejerub.pdfIn PDF document text
    • https://10s317.com/uploads/files/202108241458388521.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/33901212680.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/99854120433.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/20015044090.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/ebf4576b7c236dab71f47105ae3591d6/78323629913.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106221204582549.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d5af3f62ea2---zilaxunirosigu.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/46676595406.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/dolapitujilo.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/vazivugadegaromawipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lawgeex+buyers+guide+pdfPDF 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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 10804 bytes
SHA-256: bb0f060b2a894a8f860ceb42a18a99771bb107740118c6014bb06e32c3802371
font_01_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 17516 bytes
SHA-256: c4d471e5b8cf0c069d1ef06f7a84264efcadf3e622e190b5627965eb790f6ff1
font_02_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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