Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf20d8e1c1c2538c…

MALICIOUS

PDF

101.5 KB Created: 2021-08-25 22:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17e912fd76430bd759489261da80f354 SHA-1: 8c7ce66a9d1ff87f883d86f25b3e7730697f04ae SHA-256: cf20d8e1c1c2538ce818220a599f99166bd549c404447cc594a124e271ec9077
162 Risk Score

Malware Insights

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

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external links, many pointing to potentially compromised CMS upload directories. The embedded JavaScript likely serves to execute malicious code or redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9414

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160744b8e10e5e---tonejugutin.pdf In PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/45568082873.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/28l6fht20imfm09kiapndf9if4/gozefepuw.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081072396955---patugotefobiv.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/dixaxikisovu.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/59633296260.pdfIn PDF document text
    • http://freewest.at/jikogunuj.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e68d3f93ba55cff0f63ff46ed92cf80e/gamirureneworudovabi.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/19509121210.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70aeacb21---buxixijifasujumiwokexer.pdfIn PDF document text
    • http://e-hane.com/files/jolavomuzalozex.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/sawodumipagupejovixof.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f4d7c5d5c---12760124053.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/85cdfdb22c037aee1b35521c0bf725e7/dejinegokezofede.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/sesererotubogugakarilazo.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/rikaguwuti.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ded788c4---wimamukavetelinipaz.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708cd68627a---2446764405.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///36330143236.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f26c5c492---42982927185.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/jekaxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=white+canvas+shoes+turned+yellow+after+washingPDF link annotation

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