Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf8e5f65d790866…

MALICIOUS

PDF

79.2 KB Created: 2021-05-28 12:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 771961d83abd9e3bcda411309d97f44c SHA-1: 9b871a0d80348f9a8b911264ddf997b08a2d0f28 SHA-256: 4bf8e5f65d7908668b93ebc21d06f1d8dcddab14450ca1bc278f7e2bc6d14479
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest it's part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7900

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://irlanc.ru/uplcv?utm_term=how+to+cite+a+text+mla
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7ac058a35---rigukanowudufuwojamaxox.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607be622b5158---69100955036.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/77204454135.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090b03fcc43d---30212933562.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e386423579b1a18928cca4287d40b8a1/rofufukuvovubizem.pdf
    • http://ahkjt.com/upfile/file/wazuzuwobarebudowazamed.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607889cce225a---27228750259.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6825c7dedd57fe89a4f7ded6002fff3b/nuwoditejafawirobojerevaj.pdf
    • http://beijingxinzhi.com/userfiles/file/20210527120212_192427666.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/33230304369d333537d42c5bc148f567/vubojivuselog.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf52c8155---bagamatokevaxijufexuro.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/7bb9d57d7a5cac92ee7e1927f32ed6a0/rosekizasalavijawaxizew.pdf
    • http://3xlove.com/uploadfile/file/tukonizalagojuxabalunema.pdf
    • http://tamker.hu/userfiles/file/40764420146.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160815ce9a5a44---19292818943.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/8q3q5k042d599d5ebshq0va1k0/kigevifariluke.pdf
    • http://alliance-ic.ru/uploads/file/vojexagofurukutiro.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8745887d54---26169984348.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d2c.bin
aae61f6ac2d0a47f73f4c0aab61a153749ea3077223c09d5af47b03ce3686cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 4792 bytes
font_01_sfnt_off00011d7e.bin
5cc63bc1e5f0d5a4f9dceb203fb25e6c1c32cad70c727d69048cdc01f2a4443d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 10672 bytes

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