Malicious PDF — malware analysis report

Static analysis result for SHA-256 94762e194be893a4…

MALICIOUS

PDF

74.5 KB Created: 2021-06-20 01:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6c4be1b2a6b7079af1f2168eb4f00cfe SHA-1: 7931dc0870900833530f750ceaad17f62bb06348 SHA-256: 94762e194be893a46be58992ee30a4a916a646f7236f7e8f3c1472f6db68b8d1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous links to external websites, many hosted on compromised CMS platforms. The document body, though heavily obfuscated, suggests a lure related to 'reading comprehension pdf grade 8'. The presence of multiple PDF link farm heuristics indicates an attempt to distribute malicious content or phish users through a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fuu78n1qn2n9n474jnfco1e31r/wexuxi.pdf In PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bf11c89cfbcb94e5cacb8ee6860dc2c4/20459261108.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/d5216d725f058a4be6a582131ecf0c4e/39713617409.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b6bf215e---bazofujamejitexiralo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f6e72884---buraxuw.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff61422091---nokok.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ecd696ed643a8afb4673298564b610bf/defojewusogikifedim.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986de1ba605---66743731149.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ofa7u77vfhecu3hejjudttfib6/29193243891.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/82436420de215e80c058830ab2907106/3707589761.pdfIn PDF document text
    • http://cmtsport.com/pliki/timonokipifu.pdfIn PDF document text
    • http://nensi.si/upload/file/rimufe.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7f6b3158---49954169401.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file/%5C/kavako.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5ukfj4k776lh1m3a5ckooqqq82/94420129968.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/sromf54bja06i9b9i54a71bp84/31998371465.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/89541544a3683ffdedca0c190a52267a/72203778709.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=reading+comprehension+pdf+grade+8PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 5736 bytes
SHA-256: 00db6efe8abc2e139de12ea2b11a70895df1b01d2f62730ad74e6bff3d1ce7f1
font_01_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 10268 bytes
SHA-256: 8192de455f789a7a94ce17f21459756091b307b2585a8ac75c1fbb4ffd2c6a85