Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b3476e3cb64a3f…

MALICIOUS

PDF

131.1 KB Created: 2021-07-14 04:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b83155d0ee7f812670f8f1a3aebae75 SHA-1: 928e2c4cbe712ae51308470053de4c37212c6cb8 SHA-256: 51b3476e3cb64a3fae2dddcbd8918a717c7fb159f6b978b313d0b8a5917cd323
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9667

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://synerhu.ru/uplcv?utm_term=d%26d+5e+vampire+lord PDF link annotation
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/31d3f5609792c79cc0d6ca45f84b85ee/86166129180.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c637cc01e---malorojar.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080d942f1148---24696060856.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090779632d74---86533443681.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/73467779810.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be35a583539---70346824967.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/59442048003.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/a0p1309shr1dvqg88nb1rtqjng/24866017843.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/kuvopagopane.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/mumapijejutozozenaj.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sufije.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8cbb01aeb0a1d23780308e6b356edb05/kuwazexurakutakodivedej.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f0bb3c21533b537ed633e630e65a8e0a/21979295910.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/zawudit.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead444b15b---zikebalikoletiwurivones.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af8baf4229---luwel.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210616_B58D2AD905775575.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3549846e---4948834754.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/komunudapibe.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d46c1f0af8---jikekorawu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4092bc74c868b3c12ed452453dc016dd/93183826524.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2259f49a0b---najutonikowetebesawabe.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015739.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15739 18832 bytes
SHA-256: 0fa7153654cee7744c374139f002bfab53ce65bdeb479add0cff67d700255a96
font_00_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off00014754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14754 4256 bytes
SHA-256: a70a8b7d742620974ccbc248b4d5820a87181e578438bf2a79d47740200565c8
font_04_sfnt_off000176f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F8 66888 bytes
SHA-256: 3c20825c7a48b67046b50986a66080fb5243e2670c0c47130d7e94e476a5fcb8

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