Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f2b01a97b1063c…

MALICIOUS

PDF

88.9 KB Created: 2021-09-04 23:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4438567e05a1c8375fc905efec15a08 SHA-1: 5ac778d670ffc3215ac753e0132e8e7df4cee1f7 SHA-256: 28f2b01a97b1063c11c3397c2c8c1755fb8296c16537bb7abb26dc222f6f18d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document is designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crysiq.ru/uplcv?utm_term=attestation+de+non+polygamie+prefecture+de+bobigny+pdf PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3bfa74d4---19735622668.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/56166095159.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/jamiwenalowo.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/mifomenezinizus.pdfIn PDF document text
    • http://schubert-hh.de/image/file/45400606684.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/83835001044.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4l6tm7rcgno56tc6gs3cetbhga/23145898274.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rumewudanixewo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1aa158f72b1fa12bb1939b74c280498a/bekewesoxigamewojemin.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0a684b790b4ceb914ba57c9b43446311/febunuwitogonev.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/xedudumenukoduwu.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e149f2360---29313959385.pdfIn PDF document text
    • http://www.bash.cl/media/file/dalorodagoruv.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xetozosiri.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/939ba1e3bed5400c9ac2ad623fcba9f8/guxuripegekima.pdfIn PDF document text
    • http://jinyezi.cn/upload/modomepogi.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/18298563652.pdfIn PDF document text
    • http://vodova51-53.cz/files/39673034552.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a70a4f69951a1019d0c565c283e66d62/zubogajedi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/gj7u5sdns5d3j0u4qbtedg4o30/40970669899.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a579672c108---viviluzuk.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_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 11296 bytes
SHA-256: c71d1435178cfbf9965c37cb493af25cc2d82bf0ae639c3a95616a700a9be4a3
font_01_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 20752 bytes
SHA-256: 63ad0ef7550b36bc1eea73b59ec77239315bfd62fff0b90ede3082040b45f173
font_02_sfnt_off00013d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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