Malicious PDF — malware analysis report

Static analysis result for SHA-256 4619ddb50730438a…

MALICIOUS

PDF

62.8 KB Created: 2021-06-14 04:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 38497b9da711c6ef5a76ba6ef5683dde SHA-1: 00512ec7762bc97365bc71bc7f210409b0373628 SHA-256: 4619ddb50730438aa640916994635ec6832137112c9fdb3e2fe1aa94b2f607e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or lead users to phishing pages. The document body, though heavily obfuscated, appears to reference a 'ccnp encor book free download pdf', indicating a lure for users seeking specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8574

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://ketchas.ru/uplcv?utm_term=ccnp+encor+book+free+download+pdf PDF link annotation
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d032bdf53e---buzeguwuge.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1321ebda7d---roronog.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/zewukukosevoz.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2ffb3303---11678062001.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160805aa48f1f4---78933764336.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e6464d8ec0b0ac9a7a049e87422b0730/37608580551.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/tf44qfpb76a61htgdscg9ik4p6/muwinisuvawor.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac4b6cf63b---67804434995.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/76514015171.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160840d801ddd6---67748588242.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/65d48d87afe29c9bfb0eb4ac3e52165d/53404136943.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e660fd91c3---73184061736.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f633a545b8365d9492598db41fa94048/56491568771.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/79961516261.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a006d7cc8b85d55272e582c47fb91b40/11244943740.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/34990752830.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833512370b---42702817611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 5172 bytes
SHA-256: 5436cc4e463804bb6dfdea90843208976fc03100589ff11e2c76fd47562fbe70

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