Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e61a28aa658cd8b…

MALICIOUS

PDF

57.1 KB Created: 2021-06-03 16:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1580b1a390dda457b6da0aef04d15355 SHA-1: 2d249c5d0bc68ec22694f09515420f04f4a7cb31 SHA-256: 7e61a28aa658cd8bd3ed8d050fa68ef08e6712b853daf519c2b1cb593787813b
154 Risk Score

Malware Insights

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

This PDF document, disguised as a calendar, contains numerous embedded links pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive link farm suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8542

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 http://meble-tk.pl/userfiles/file/nofixukotino.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/45c7cf6504328ea9c49607353c83bb6b/mageweneb.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fa0a3b8d1---36184273224.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e39052690---28350022149.pdf
    • https://luminex.pl/upload/file/98445607886.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089424b98846---sedov.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/19ddfdb57ddbcd75ab5c98743bf68d6e/83733321177.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0i18j3poi9jr9is9at3uai44t/4308007247.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/89401562907.pdf
    • http://albino-pitti.com/pub_img/file/jikibadizozi.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55fad4a8e---22916406565.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kfhi9980heugbd3ei4m8t099mm/24668532488.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8cfb2ba86dd201f1e2d741c1b548c277/lavokixoxade.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81f46fef6---92073211567.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+calendario+2020+mexico+para+imprimir+gratis+anual
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e5.bin
73972028b8155189a57f109a436875dfc14349a0991d34311d684d59ab0b4638		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E5 5816 bytes

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