Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef384f8d2a5dde9c…

MALICIOUS

PDF

91.1 KB Created: 2021-07-25 15:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df76085c5ac21c4ad2099c896be1cd24 SHA-1: 73ddaa94637ff165e84b5d496cba4e40f22d9df6 SHA-256: ef384f8d2a5dde9cbb5f60320cbdc0c5959bb2936863282e6fc85df117a3816e
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 a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/21a95fb762ab3d06f0cb57dc1117dd0b/jewiwanitusitoxiniwu.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/98587561309.pdf
    • http://krajinar.cz/soubory/files/rugosutesewov.pdf
    • http://www.tobywells.org/media/fckdir/file/lazaxakekarumadolatom.pdf
    • https://manuscripthandler.com/userfiles/file/15524951899.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/86501377066.pdf
    • http://dejede.com/userfiles/file/42338811805.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/04e9a78b354059eb1f5bb9ae142fd064/59208482926.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/24276343063.pdf
    • http://dissanna.com/temp/fckeditor/file/94535830140.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b67f67af6---18190007000.pdf
    • http://danielbushreunion.com/clients/41596/File/4981521139.pdf
    • http://mevlanaasm.com/resimler/files/37932991831.pdf
    • http://poltinik.ru/userfiles/file/25771937247.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/b6k7hiff3b6cnnbgh0e08dn2ne/50066714803.pdf
    • http://bjeclinic.com/ckfinder/userfiles/files/buveropiwusokixomebijer.pdf
    • https://floridainvestment.cz/files/file/mamew.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16092a4f57dd1f---84011109391.pdf
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/94830442340.pdf
    • http://amadpich.com/userfiles/file/pawijul.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd14225da---wexebevijupojefajuzu.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca4d0db24---lines.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a468ec2da---65001986405.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f9553882d---41766693604.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=annexure+c+for+minor+passport+filled+sample
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe4a.bin
c1b102946a6727a15c415075f55dc2edf36fa4d6a913e2c13458fd2252bb9231
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 10964 bytes
font_01_sfnt_off000117c2.bin
74ecb6d084cfb654299a53627a515bf04ea22810309fec05417e82d673dd3a88
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 17632 bytes
font_02_sfnt_off000145a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145A2 16792 bytes