Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cadceafc33c8553…

MALICIOUS

PDF

62.6 KB Created: 2021-05-27 20:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10592221087c210f7c01a6af73fbda15 SHA-1: 1b4695daff6adf699d42bf6d67cf53478ca086f5 SHA-256: 3cadceafc33c85537ee40c2e82cc6f5eaa18d47efe8791bc4bae6d60fc141088
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=como+descargar+el+libro+el+hombre+m%25C3%25A1s+rico+de+babilonia+gratis
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608117b331207---29131188801.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9fd22626b644c74608afb0f4a0e5082/74893875893.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7e9da56d---valugumosuzogowalogo.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8m58l9ev7olu2nh4vdcm8grct0/sovumu.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/si92d02o264h6itag6se7qd818/49420077612.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860d77dc047---32703537169.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/98dbfecbea55b03e8b82707c6e9f2079/96585646894.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a88494490c3cec84bb29a02152f62241/ganumonikurifuzu.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097cb791f09b---66923125678.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/64968a9f21e3ee21a7e366518ee1161b/selijapewixorakomizez.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/60af0e4191791ecab9055a9777118053/kamaforuvowesa.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087584586fcd---65061526.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609289e3be66b---75169087937.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e58bd272---jukodanuwagetefanu.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6i09ocpe2bi3vcme7fm36mjiva/zutedipem.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/438600cf22e82303f56b56290102bb67/37229781687.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ee5222ad1---51218696159.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/dimetejodejowedenor.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df27188282---naxebaromebowa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e087.bin
e70fb9a18e67b169fb0acba65e9c52a7794a7a9b26e1c55c8f1858ff51ff1dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 5536 bytes

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