Malicious PDF — malware analysis report

Static analysis result for SHA-256 858ea02e281d4691…

MALICIOUS

PDF

195.3 KB Created: 2021-05-28 01:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 477a7aafc47eaf48b3218e338282dc19 SHA-1: a89207868c187061bae2df9969608741a86e30fb SHA-256: 858ea02e281d46914086c26080921eb64720227da1f66d39c12dab9ff08494dd
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites utilizing the FormCraft plugin for file uploads. This structure suggests the PDF is designed as a link farm to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bacbf186---86412669213.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b019932df31---wetiwoxixujozisafe.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bddb197653a77affeb2978011faa397d/59951286493.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a87fdcedf24---27602249418.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2c6895db7fbed2456714bf860196f143/98375363647.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160796a47a76bc---mejinopumatazenisajose.pdf
    • https://hogies.com/includes/template/uploads/file/pesetera.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/327451ff2418437fd75988f425a49750/5834397684.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc9f408fd1---85666722072.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/45beeeab2fe6595ab54c2c41162f2c29/gujawojubivitiwesava.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/fc793fd6c04207e6f3555e6ba2cf5ffd/39440564455.pdf
    • https://amatnieks.com/pictures/image/palofunokewitabudez.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879e88422f4---86498106337.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083784ebf3b6---61289049966.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3c1e7146e801aec3343b8e5f1c42d284/xutasujuzode.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160acefbb39908---pezosakobizajo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+nature+and+scope+of+urban+sociology
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002e5e0.bin
b702730ac1ecbc66721c5d2e255c2b0899606498906fa53a56c38d256beb0e1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E5E0 5672 bytes

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