Malicious PDF — malware analysis report

Static analysis result for SHA-256 196acec7afc24528…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 13:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d918b410ecaa8e4a7a1617fbc7e5829 SHA-1: 4199aef2c3963550d9e4eb59e2a39c2baafd609f SHA-256: 196acec7afc24528755743d97346867e4e35652c6b4fb4a2b6c0a68523b0a226
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing numerous links.

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://sghscsjamarai.org/guruhargobind/userfiles/file/37873143199.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e472e7ff68e376a5387a1e69ac6bc066/faworakuvotuvubamef.pdf
    • http://nowator-zpu.pl/userfiles/file/wemofogilanir.pdf
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/dafumorivawapigopedefem.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dabe91aaf97---wubuginonumozop.pdf
    • http://boothbayharborshipyard.com/userfiles/file/95555192593.pdf
    • http://babywagen24.de/userfiles/file/6920227777.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21e1cc8d70---teradi.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ec0f4067dc08d511f67418173bf910a0/dabojemomeselamimidod.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6bc5b024e---tumese.pdf
    • https://bobecoingatlan.com/uploads/editor/file/dojuxutasofekiwosibamesak.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd626a985---57943572927.pdf
    • http://ankamet.com/userfiles/file/nadejutonum.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0dc459b2cb4ed44ce075cf3b49784b8a/dudixot.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/l8aeq13igt5dbsefoe8nqdo7kr/vabewiwut.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1011i264mu70h0a20tk6q1dg32/zigimumevuvikemedi.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3d2c7be7f73d726be885f7878fd1b4da/26020179582.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/91bda50693af425333893c30c79ef44d/36921413163.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1ea6ae66abb6f9a54912650ec23bb378/pefomal.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718cffe4145---14555784919.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e63b5924e---vosoruvev.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf968dca23---befakigo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=children+live+what+they+learn+pdf
    • 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_off0000eb4d.bin
5b830cbe29e4871d734c3ebb4f4c3ede1524a7ac799e49d634662dc267275329
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 10604 bytes
font_01_sfnt_off0001037f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 16792 bytes
font_02_sfnt_off00011b91.bin
b8dd50807af944a99466300c63caa2592fb185bff28a2a4c72e1d6c02774ae5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 17016 bytes