Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c404d76d5b1bf47…

MALICIOUS

PDF

81.0 KB Created: 2021-06-15 14:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e264d96eede488b1295380790ad4666c SHA-1: 1fdbbb8c29dd870d2e6129040f37d3a5e31914cc SHA-256: 9c404d76d5b1bf4749a367ef0fdc53f6d25918b3d2f4d78b3d778d1cfe743d6f
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 high likelihood of malicious intent. It contains numerous external URIs and embedded links that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a 'utm_term' parameter in one of the URLs indicates a possible phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=minecraft+item+drop+physics+mod PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0acad40ab---26594853079.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/zitaxezabulixamovikag.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/34673216598.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/05794a65d6fadb5bbd3e112c4e6f85a7/61602599250.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5c29bca76---50097898386.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b1f8b4e51---kutatuwikojigeduvivoxekuv.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/p2icghis8j9h8m2c0mdt6bvu58/72298419091.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/52453777e278ee03775c12b773a824f1/14955399154.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160856be1d5f84---sumusejagazolibapibidapa.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607214880e1a2---kadutupog.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609187cd3b0f2---40725982881.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c2d2ebd83be773131e92d1e6e76f8d16/25842547506.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608db23951abd---sifamizivolopusez.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e1d89208---bizexipuworabutapodo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721701361c8---30184290185.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecadb15111---29859379500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 5472 bytes
SHA-256: f0abe7f3ffb2d2b0219c4a30c29ce705c9af976bde8431c5134a35d7a32d3044
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 1936 bytes
SHA-256: 246569b5fd7226bd0ebf3c016de7ba0bf82e996896d660a08030b2af0a08efd3
font_02_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 10796 bytes
SHA-256: d8d79c01e33c199f1fd51a97a11d7bc2fbf40875c639e67518755464106845bb
font_03_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16392 bytes
SHA-256: 954f30c1cce2e3a00f07cb0ababb04bf86a3a3c34ed8da2fc782bdc014231390

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