Malicious PDF — malware analysis report

Static analysis result for SHA-256 18777e052f208572…

MALICIOUS

PDF

63.6 KB Created: 2021-05-06 12:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81a28d90f1ebee19b6ffb83e291df92a SHA-1: 218a315446119c4acd913497497dec0ae0e61be3 SHA-256: 18777e052f208572c95aad30ed1a52479bb3b122774e9142e37a6de387452477
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or downloads via these links. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9188

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://ottotech.center/userfiles/file/44042511968.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8aj9msk7hvsalqloqn458med97/kapero.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd064672d---zugijegurew.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607df42967379---tudovewokiromabaxoxi.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tqrucru77nuavfv78plm09t8j3/kibivewanemovefimevijo.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde181bf77---81615422505.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160818e8eb2828---vafepo.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/a0dc09445921dadeacd072e095418597/64477879790.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f56dc611ba---18661251850.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/affb95a4af1d0626cfcf577ef66d7c87/xapojoxomomudopedi.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608636fd1949b---26098319739.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/dkeek6a96rm6f1qukjkub2vuuk/24528848577.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081209dca420---19538598430.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/gldgk9tq25smuffl6gp9ra1vj4/fipefamif.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160898977bbb20---lukefufubafatikomono.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9910ac262---tajudufabepukasemoju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=spatial+data+science+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf6.bin
1286b8193ae0fa4a47f6e8a41aea7d63454e8f514ecf4995907c1a960340f2fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 5156 bytes

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