Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29cf25fbf52e3fc…

MALICIOUS

PDF

85.6 KB Created: 2021-07-13 17:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 85c1a48c95086377dbf3ba76aedfeb98 SHA-1: 30a005b4d015574c4b0344c374910565af527c92 SHA-256: c29cf25fbf52e3fc34ae2c5e0ec4dbbf3445d4317bccd0036659de00350b92ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=play+the+song+blueberry+faygo PDF link annotation
    • http://portableandcool.com/files/files/74628261180.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0afbb9cf8a---64902875162.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/lologujadepazikijavin.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3e5caab55---869411298.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/78588634629.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/37781279028.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/99433518239.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/22144839572.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bv2c36ccatl8a6e58ojovj5sg0/jupulejukepuxivebe.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/q54ukjleum8ij5qume6d1gl490/77677431250.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3444ec3618---96788783462.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/xugiwewuropo.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b0b27ad2---pigalokex.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcfd6188e2---vefajevafobifup.pdfIn PDF document text
    • https://landbar.com/upload/files/gonujiwidamivojuwijila.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/virojugu.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/tododarexone.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/ladumamolurupakef.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f2bdb8d1121d159ae5f507a9dcd23ec/gijujopunosozajelizoki.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/lizesasulavuronop.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e7fbc741e---zovurawoze.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/vupedifofuxofage.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e223e55eb---26479091431.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/foranoxikumiburisezojeme.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_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 10756 bytes
SHA-256: 39412e62dc75dd567085b7ee173826b76f59c6a4824795ebaa368f85d49a5851
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 17704 bytes
SHA-256: 7208091f9c66ff853f418bcbb76c8fa83b916965da48156e1b13bf8ca0762822

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