Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c28e69e3ad7eb2b…

MALICIOUS

PDF

83.4 KB Created: 2021-07-19 23:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbbe1fae46f2fd82492e3e84f01d15d2 SHA-1: 14e8b7d03c7f30b8d570c67945b4f73e1008b66e SHA-256: 9c28e69e3ad7eb2bafb948c047dd25238443660fdf42ae29a5ebf743de85101f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://classtool.info/upload/files/33947733719.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a0861a714e5646bedf7411c3f0fa22f4/mapofelejerefaxasejom.pdf
    • http://scamps.biz/userfiles/file/83277509382.pdf
    • http://colorfulmedia.de/fotki/fotki/file/zevoragubamixejejuwu.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/03f81b8c1fb9b30f10159e21f4c68a01/30574670025.pdf
    • http://4bx.pl/public/file/janumisebapuv.pdf
    • http://nanoscopy.ru/uploads/files/paruriwupagomas.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/vsmpv6nnp0d0gj3plqid3k0f5u/89212843735.pdf
    • http://aviatechinform.ru/sadm_files/56534862310.pdf
    • http://aelma.com/sites/default/userfiles/file/puwixilowutijufawefaneru.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608716a79b802---2404334775.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bec89ddce5f---bawitetizujesud.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a8707f51c80---70511333224.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1d9e4ed8c4eb957e21e3c259b36d9cd0/foderusoluzelelo.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/51713674839.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0392bd0f---zudik.pdf
    • http://pphjako.pl/userfiles/file/liniwokixugujoruputamo.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b1dcf3842372b3facd2fd2495e74f66d/bubunez.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/813de594ca495e8ffbb7d4dd03835185/94303563139.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/vavonimigukafaj.pdf
    • http://luxe-pools.fr/i/File/fuxinediwid.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/68193053980.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dr+flowers+ophthalmologist
    • 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_off0000e3f1.bin
1b462724014e00fbc18cc932c8cdb233d44cac74c8bfa43bbaae15e73457e904
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 16796 bytes
font_01_sfnt_off00010fb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 16792 bytes
font_02_sfnt_off000127cd.bin
560ae744983cf5743e71ab0e21302f3b343e38348948679a81fd486e3f86475c
pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 10788 bytes