Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f8424f57df80b7…

MALICIOUS

PDF

91.3 KB Created: 2021-09-20 15:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d1d62184f93c5957d0510ca63c51ea6 SHA-1: 6be6ca7f5947c94ed2b38784b3f516a6dfa8d241 SHA-256: c4f8424f57df80b7d998ecf0b7ff96c35041bf08ec51a0a23e75590f43116e4c
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, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a 'Pdf.Phishing.Trojan' strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=before+we+go+full+movie+online PDF link annotation
    • http://cobmedia.hu/include/87002588247.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/dexoboresarabazuwulezo.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bakik.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/71938031660.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oucukm2rev751idg3b7db0p580/38267937812.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/sugapemirarifidabi.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/46423837660.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/ladabapalozejijari.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/ruguz.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/10388355500.pdfIn PDF document text
    • http://precisao.org/files/files/tajunonizujina.pdfIn PDF document text
    • https://network-italia.com/file/36072904360.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/ridafanamotorevagowa.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/83811967661.pdfIn PDF document text
    • http://iknow.pl/files/file/werekinekofa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161472aec8b4e5---bimegoliruvig.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/16381736720.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/danedulodowo.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090521221925.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4fa7667bff881210416a1ba6994d69fa/66931512180.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/zujosorobubagozuzemogal.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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 10432 bytes
SHA-256: ea0db01af26cafeb2d69cc7735e874359c3a33c65fd2e1a455c09dc325da1292
font_02_sfnt_off000132d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D8 17228 bytes
SHA-256: 558139ba5db78693a7bfce8c3abd2d5ef2a1430dde56f7b2b21f8bddbae55c7f

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