Malicious PDF — malware analysis report

Static analysis result for SHA-256 0edf7021fb1be89a…

MALICIOUS

PDF

104.9 KB Created: 2021-06-27 06:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ccfeda162fafaa626facef1ec1ba4c02 SHA-1: 3fcd811b0d4a512327ceb6d25ccd0618870adb2b SHA-256: 0edf7021fb1be89a9f624e8d54a00b9dc7b94bb298f1b195da312b08a43bb64d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection, likely leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/c8023f5c68f0279fb66dd7a96c7de219/gitikogoxub.pdf In PDF document text
    • https://louvre.lv/res/wysiwyg/file/sibodiwadagewagegemus.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcdba3e705---67427281142.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/81112538675.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e5e774fb---sonaliwesotadunizaxu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb74663211---viluwulu.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/fa1d77ee926c5df13efaf369da2f6993/27161860276.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/86271004551.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9183375cc94d6673032ed0f2081123ef/5992851974.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a69b2d18136---timixipurekupotemanajesi.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/mogovok.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/47498350812.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/v4f7o1b4houkves7fpsnrmhdc9/60443084463.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/89486963338.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/29153691027.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qhmf2eajb2ig8onohqaku01ihu/48062233420.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/22581553438.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/nemamisenudaxabexejowa.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f94150d12da48035511506b11fd5b7a9/75414799127.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7619246ee18bf16844572456a76b0746/xubedow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=number+of+polynomials+with+zeros+2+and+1PDF 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_off00012f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 11412 bytes
SHA-256: e98bdecd1fb4a8c0cc0d875aac7c1c61b8c8ec8595f2382bbd998aeae012417d
font_01_sfnt_off00014a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A50 18800 bytes
SHA-256: 738cc603420875613000a4919cf329a24e71ba2d771783e586e1ca3a78b87804
font_02_sfnt_off00017c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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