Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c21c60795d9c321…

MALICIOUS

PDF

70.1 KB Created: 2021-05-24 04:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66981ed434c3085b983ad8644f18f246 SHA-1: 5004907c2fd3d0f135db74e648393184eb72f38c SHA-256: 7c21c60795d9c3219a9868ec53dd5845a800d88450c174544fbc7bafb22d45db
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8655

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://coretry.ru/uplcv?utm_term=auto+liker+apps+download+for+android
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/5aeohh1caamilt8s7h7qe9vkpd/97509397665.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/k8kcanfcg6beknb4a1ot07n39e/galanoxovoziwaru.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0f09d435---35196736767.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed194aa1bc---68949703282.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/hivfmor666tfkshl53sls5fe4t/wowafurelixedogekawan.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h0514kf3acg665an4dad3us5as/79479067154.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608747b251a61---65927024900.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a109a177c1c---giwafimojonovefa.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160821ec23d23b---nevazov.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098971b79d8b---jenaxodema.pdf
    • https://zlatartopalovic.rs//files/65373800079.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/db1769ca5f7ae9bb7f5257b17ca398cb/60560947698.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f59748955c---9285611037.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/45c6cedd0eaca3e1d88bc4495485b41d/66519393328.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_off0000e80d.bin
5766c99717d36c10b73ee0161335502c8cf89fc104dff8384f6e812cf9164bec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 5180 bytes
font_01_sfnt_off0000f9cd.bin
2f6c16d6cb92ae615993dc114bd4c12c0e061222c1cfecd456aae65a08cdb2bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 10648 bytes

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