Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a6513e0366909f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 06:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d221c839e2f5f2fff287165bd245caec SHA-1: 57648ae5bc458a35a908414b259fcfa25708b427 SHA-256: 24a6513e0366909ffa8797f26887d50c607410863f122c56a29f1e1d1236215c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised CMS upload directories and disposable hosting. While no scripts were extracted, the nature of the links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://responsible-tourism-alliance.com/content_file/files/fagatavimiribekokuxala.pdf In PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/zomizalowor.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c5122a36ac---85928543218.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/29008100343.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/wixibuvizopepitodobogu.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/927303403.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/karugupuxoxomeda.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210909101025.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/zebunafavujudewet.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/27463517304.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/97458708952.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/tuburovizakoraxapixux.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613649e65770c---bubusetiwibexuvezanu.pdfIn PDF document text
    • http://marymo.ru/uploads/files/jomuni.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/84966320399.pdfIn PDF document text
    • http://xycrusher.com/d/files/jimetobova.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/44846469065.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2ffa47a5a6a25a57139860fc84b73326/gugozifamojamazesipewuz.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b937e330a---modixolix.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/43982933212.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/35362878078.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/98440657120.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaaf9d2269---31014821632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=come+into+my+trading+room+alexander+elder+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_off0000c73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 10920 bytes
SHA-256: 21661c905cc19e183b1ae916a161136bf366ec3cc3af352c892e1f3d5b448fd9
font_02_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 18340 bytes
SHA-256: b6f8e1e375165483e41cea1f4a1177224095b8d96f46cb8ad8b98431a7f33134

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