Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3046f020e90b27…

MALICIOUS

PDF

61.0 KB Created: 2021-05-13 11:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c74e5cd681127def2236caef868980cb SHA-1: 93cb667ca5af43883af64b5eb7780dc9c158e22e SHA-256: 4c3046f020e90b271b4e0b0068a42a87831e5eb2583147b88fda2b6f43190d9a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to lure victims to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

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://archism.ru/uplcv?utm_term=aws+architecture+diagram+template
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/unr5s3susqbul6930sm2rfj101/tixoratenebapurorupez.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087efe3d26c1---duwudanirexosojukat.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607132804228f---58000808443.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/94120701600.pdf
    • http://alexlunacoach.com/img/editor/file/44880119747.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851edbf679---vobobozab.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609421db9b082---xagutosevofela.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eaaf5946634ee0890f4e03ddff9abca0/najosimexewulun.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6de3733cb28e09cccb7655761784cf03/29559056980.pdf
    • http://aqbnb.com/uploadfile/file/80471095135.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8a011e93---fojuku.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/2100b3db49c8e127c3530c091be0f3e1/20830635277.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/o8p0jb1urhrghu9l038bd1tjfi/wagam.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1fefb6a165f159f31bcc18f190398194/perobilonatiboguzigix.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5afd0e5b96f038b0fbf2dce4fa45c15e/jipofolajuvag.pdf
    • https://aspirans.com/files/file/koxali.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b89999671a675ed7949c527b6fa397a9/28488453210.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_off0000cce7.bin
96e87cce7891c381c92dd07b8c94e3eed66559fadef432b91bb007d0db764120		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 5568 bytes

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