Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e5802a92fdbc2f…

MALICIOUS

PDF

65.1 KB Created: 2021-09-05 02:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 503b5a1213054173ef3826ca19c66e16 SHA-1: ad8c8b3869771ffac1e832f24dec6d5a5a87e458 SHA-256: 39e5802a92fdbc2fe78fd491c1afb378b806ea4ac6b56d31182601e648932ff6
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS uploads or disposable hosting. This suggests an attempt to distribute malicious content or conduct phishing by leveraging these varied hosting locations. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

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://lamorenj.com/userfiles/file/30367333454.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/10002243238.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/a45ee5a2338bf130f4b31e622e3b95b9/folodatozam.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/37437690710.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/41673369574.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/polukakobomiwezuzuforejax.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/19184991542.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f453ba85f9---vowomigubakubabemoruzaj.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa4dfed57e---7134262027.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/bonulu.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/nevesomudafe.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/71370637150.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/zixesifuvoron.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/lubuzojokizilijijor.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67bf8903de---fexumepifajumazasijawu.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/tejawo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104742b5c3ba---16833375594.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607359a8ce38a---81160101067.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/ditevavodebo.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/nifosozefafurugol.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/40218214425.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/38126414308.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/76761336255.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be68bbc73a0---timoxenefujikavituk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=streptococcus+pneumoniae+patogenia+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 11092 bytes
SHA-256: 07f4112b47b1f6094a72b509d4e3f7482656d6653739172018f4d5d7c251f820

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