Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96026f931f9918c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-04 04:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f17ab7a90b4cf978224103939a798b8f SHA-1: 52b8288e4a9a8ba9ba0e2f93e2ab818202e0e3f6 SHA-256: b96026f931f9918c0ffbe86d69389073d336ff25c5be25f80efc48c7ecb70105
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDFs. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3kt65ptqtc4undbei0meejgvq2/70669393912.pdf
    • http://ohappy.org/userData/board/file/12909167755.pdf
    • https://signika.pl/Upload/file/vigodudag.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2013e7d189---wenezemedojo.pdf
    • http://guides2alpes.org/uploads/file/10913775344.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d60d1bb22027f40e31ade85acc89fac8/vekisezi.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5a7f41c82---nifepuradurifaz.pdf
    • https://youkuvpn.com/upload/files/1940450623.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bgvh8duh8a5huktsi5rug9tcrh/67278223538.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/46412624384.pdf
    • http://gloucesterclassof81.com/clients/23558/File/buxofi.pdf
    • https://tmtteks.com/files/gutoxerelibojezepurodi.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0cb7005f00d3d1ac546201660c2add3c/noxabifunewovimogetida.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/gulewigitufojazexegetu.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/mabarabedapenalo.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e425e96f4---xiguvilasubopemeputiwizam.pdf
    • http://zonweringbelgie.com/ckfinder/userfiles/files/pavijogowiliniliju.pdf
    • http://ahkjt.com/upfile/file/bobitubunikozi.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/0dr4ll2oj39bas2cgt8qbf8s6h/67439580208.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c8224daf60f932166f1919878d392fb8/34661227653.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a644eb29d4f---berejunugevovige.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dce3925bd---6885219506.pdf
    • https://techson-cctv.com/upload/file/18415757366.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d86748e3c64---wajofipanalolal.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/g9iv2mfqj8o59mu8lg31j0qq6e/bovuvawidese.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=suite+life+of+zack+and+cody+commercial+episode
    • 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_off0000f571.bin
1195ea62a549ad855c2e2748209da062b32ef01f7d2f5d49a3ff5af54e58b4f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 11220 bytes
font_01_sfnt_off00010fc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 16792 bytes
font_02_sfnt_off000127da.bin
2c2f45ba50c14b7db0933f08e7da1bb5e7bc220f01b6c52d2ee2f3d35789de80
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 17832 bytes