Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bc6d439bb2217e…

MALICIOUS

PDF

71.1 KB Created: 2021-05-12 02:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1d57d8bb433d15685c7ed09215be042 SHA-1: 2b5a9ce19385f29f02b3b78e09bdebc3b6e867f8 SHA-256: 38bc6d439bb2217e0467fcfa95fe97c27c1eddbee6d817ca2b1a42049d2b9480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=tesis+sobre+bullying+y+rendimiento+escolar+pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8bj6ahjgi5j61vlh16tkg4b744/finupuzesafezutofuvizoz.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8c33782a14f919b6550d0aa93a79015e/vipuxujojebed.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16087f91fb6228---famebisaxu.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608022cea1804---rusufegotelikizopo.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/c9pu2srg2ul6l53v6s4vtnlbo6/48309981022.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/93489079e00b28c43518fddefffccb26/xulesabafikidimuxo.pdf
    • http://agiusfuneraldirectors.com/files/file/53511633364.pdf
    • http://angelcabrera.com/FCKfiles/file/foxunabozajefi.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rd8cd59q5jv9cr5tcokh42454q/vovesixidimevod.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa6beb9db---28863277205.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afae367e9c---jefozabobel.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c035a861cb0c4bd400e3f017a0fa704c/surovuledemuposibotevumu.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//13377210803.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/4318678177.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071498edc178---3869321760.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89c.bin
d064eed79361ac2b3a729e30619429d88438ccf6e87984825683178493a9b19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 5668 bytes
font_01_sfnt_off0000ebd1.bin
69b1be30eb73a3fa1a5ffd68c86c84b3e93faa8bfae4b3de14f83a34fcff0349		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 10452 bytes

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