Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d3b4bc3884a1d2…

MALICIOUS

PDF

45.7 KB Created: 2021-07-17 12:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 590e9df46252a530b1f5df585603af22 SHA-1: 8b7226f43d47008b920651e6ca19486763b1c72f SHA-256: 43d3b4bc3884a1d251c07a7c1ef76b05cb0255511f65c6a30c62013d11e28593
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads, specifically WordPress sites using the 'super-forms' plugin. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7355

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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f521a02266bf9a1be3caac07cf4ece6a/14103186344.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b5d8231271965253a48e65f6b69e1d7/xudovabirogu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d725721f004---kafanoradali.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/61d0ef9e038fc73fdd91b3b08ee4352c/kitadefenafipapabesesa.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/861jh5gjhmb10k2n14qf4ugch0/86484065020.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/27148017781.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/f85v875ri47mn0ee2pt8hj5nnc/mirudonu.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/kixagexusu.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/76960104612.pdfIn PDF document text
    • http://alkanboya.com/files/file///lowugemosamokesodula.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/siwopagiguw.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/1798413625.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/fewedofelalojenoxivapade.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/gawodamaninewelulepozovis.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/28846065009.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/tivulazapadozigar.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c24dab30---10831938856.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0b65dbf93d3690bd6e8a694094c3b0d9/39746679568.pdfIn PDF document text
    • http://sparkpro.lv/content/file/senodow.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160907aeebfe3f---35814508553.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c6d48a91f23234d94cc010230309bfbe/rozonodudalupe.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/8735760109.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/57617393674.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f58ea6843adaf8732df63cbc5b02dd87/25745222883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=different+types+of+purisPDF link annotation

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