Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3a29ece93d372a…

MALICIOUS

PDF

85.2 KB Created: 2021-06-19 17:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1e451e9109268fe9bddf17f6b91b4295 SHA-1: 1566b2d944e5946ab34041b5294ddd01e4cf9536 SHA-256: 7f3a29ece93d372aa16078f3d3b347c65410df2b0123601671d914666b4d05e0
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically to serve as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7220

Heuristics 5

  • 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
  • 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://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/c9778b97f9c2e58c87bb411a5949b879/90477642365.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e804c3e667---91918663443.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/razogaxuxip.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3f19df062---11357199634.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/wilamoretizakud.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/78946496479.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ea4f429d5f8d89f45671f9a64ad32f84/32513082021.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/blceuufbke64mfh2luq6qdb981/31433325669.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/6gq6vvod95hs1t1435khu22ank/muwuf.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e27df2e49070b7482bc05839b7738f0e/pofimikuzivusupalisopi.pdfIn PDF document text
    • http://szpk.hu/_user/file/84045788478.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/49216084660.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/dc8219d38fec3e264874e33cee3d31f7/laramakanigaxi.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/68898388187.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/84d000af8401e905d6e7ff88a3b88840/27682688986.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/cjm4v53bq4j8tfvvb1rhmu07h7/tilel.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m5p5caium2ebujov0gnrl5hoq3/79864691214.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a15825764---kotovozimumekariwo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160741c31a5c49---6840046765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=list+of+idioms+and+phrases+with+their+meanings+pdfPDF link annotation

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