Malicious PDF — malware analysis report

Static analysis result for SHA-256 401739f65d5c56c8…

MALICIOUS

PDF

61.0 KB Created: 2021-06-06 19:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91c8cb2b82efb292b37c155984c637f0 SHA-1: 27bb5f4fd2e82729f8e762b65a662f955537fabb SHA-256: 401739f65d5c56c802a1833d82bcd51ab212806ea294d1a4a3dc684291b180b5
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into phishing scams or malware downloads. The presence of multiple external URIs and links to compromised CMS uploads indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://allytemp.ru/uplcv?utm_term=who+does+ados+testing+near+me
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3cbb477f26148b96fa683c22f3078b72/50312451131.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6a423ef17f5a6e75aa2c51042e61de73/suviditavenajivusufuxo.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608913ef5c397---92855280787.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccab7b5fe2---58712024280.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e27b9440ebd2b6fca82aeb4f41dfe766/1657107451.pdf
    • http://aldo-ins.com/userfiles/file/38195157302.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6715171c---kotuwesaxeduteveju.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c99f76a095---pururibon.pdf
    • http://www.jindatunnel.com/up_files/file/27523888338.pdf
    • http://emurus.jp/userfiles/file/jalogode.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b150c5d08bb59210c7cd27aec457ae99/velepobovomanuxedituto.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0957bc3309b1b7159cb1c04e14bf2e3d/76366288580.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a5d7014f0---fawakal.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/b0598cccf74410577b024f52601a482a/fexofijupovilunido.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47e666d6e---fejomuzikisagomebopa.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210517234727.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f4.bin
d1f6803afddf73d3ba961f451527a296388bc13aaa6e91d7a698794ac3899a83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 5220 bytes

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