Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1373b3f2b82109…

MALICIOUS

PDF

57.1 KB Created: 2021-05-13 13:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0cd2beb16e6faabfbe3423f87fc0f37 SHA-1: d79fb7a5b01e8c11b5498d5d65b37831578dc940 SHA-256: 8b1373b3f2b82109c0bae990efb8984f3994354d2a2acfa756f17e5eea299eed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a link farm hosted on compromised WordPress sites, directing users to download files that are likely malware. The presence of external URIs and link farms suggests an attempt to distribute malicious payloads disguised as legitimate software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7337

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://nomylo.ru/uplcv?utm_term=bluetooth+headset+pc+driver
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607140a9c8f26---wowax.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d649b5d283---252712358.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/9abfd39f1368bcb82defcadd76cfba02/76399769947.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607440fcc6eaa---nuredanobiwawepesukik.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e932a7c702959882c5ea5bd897a4750d/tadogutaki.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef1eecbe1---tadunosulo.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3571818f9---61456989774.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894c7087842---59017389061.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0c454da97a31b7f157827a777fa42b77/korolapaxofidag.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/603c9e050808367ce8db2b1be0de38c6/98115842867.pdf
    • https://acgroupenterprise.com/userfiles/file/buwiwo.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730bddd03b3---73749626273.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160877707af75d---40591204198.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9sj1jcu88fkotqpij3piajke20/61231946712.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/9eb8e80c7c51a6d8244ed700aa626a1a/48577560651.pdf
    • http://ajtoablakcentrum.com/_user/file/81701641543.pdf

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