Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb66af129f048156…

MALICIOUS

PDF

68.0 KB Created: 2021-06-02 12:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcbaa1c7975f5b533b5486d61387cb8c SHA-1: d8c09702f88effce6689a50d60389baee7ef1681 SHA-256: fb66af129f048156c28b79d297aa97ff2f5f49aed3e87d28f86db94dfd9bf0c6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0645b87f---deloxozo.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab296124b---89437970751.pdf
    • http://bebelino.ru/userfiles/file/bisosatudo.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2bathi7st0jht1vjotmhgkna75/62124403758.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2d342437---rajupet.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/10ub455n9dkoarvutfhjeu32t4/budebekudo.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6937af89cbf200b238b06e4c543bc00f/99238057216.pdf
    • http://j1medical.com/uploaded/file/fufoxubod.pdf
    • http://arunimaflavours.com/userfiles/file/mawezuzawure.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d36e1ed64---jaleguvodirarerojesoxub.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/771c6bd029e8497298223a61fc7eab8a/guvurabupokijukiniw.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/80pus3aknsui8e24hhvrt2907a/vefedofakulevubexiwizidun.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff30e18dc9---wukamoruzuseb.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9fc04d4eeb9fc6c69d808b8b0eb8ecb9/79059961640.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/8ee12a10d4909880255e428ca39d959d/vunawikawidegozuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+watch+your+wyze+cam+on+computer
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df08.bin
46e86927696dd99446ebb45116e8d8f35bfecb1c89bb3087cd4d7ad814501fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 5112 bytes
font_01_sfnt_off0000f05d.bin
8976ae212ba30bff43b68779b0bc35e7e0e39ab9409c698a6f1e9892e0f24b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 10956 bytes

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