Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c39e9b18a6920b…

MALICIOUS

PDF

62.3 KB Created: 2021-09-10 19:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1d01b4a5fa7db50da751bc0d40f6fa3 SHA-1: 8989b8dde6a476d233eb6aaf9c3c305c812a8e6c SHA-256: 83c39e9b18a6920b71b66dc0d625b877ff94508a488f5ff423bc20d7dd277ff7
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9121

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://araulmor.tel-cor.com/images/library/file/xejediropowotug.pdf In PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/20742386652.pdfIn PDF document text
    • http://apsons.eu/files/file/gazerawubi.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/54758420644.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210907203656.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/059955b7e1c036f89c3fb30d1bf97055/3018615624.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/povuvabixazobijumi.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/rufet.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/13875428797.pdfIn PDF document text
    • http://freetds.net/userfiles/file/36951078848.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/wisoles.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wonurexavupiperumuxap.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/zotugulamej.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/55057020840.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/9887019199.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b04b02b97---waxozurosolizejafat.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/loxopuzisaso.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/38484853217.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/nefig.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/36572903044.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/dabemefawewegawokibov.pdfIn PDF document text
    • https://polaria.cz/images/file/vixidovikomuno.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/16c7a083a1b2479b325365483517d8ce/37804294952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=weathering+with+you+gomoviesPDF 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_off0000b7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BA 18248 bytes
SHA-256: f90610a86d71e35a12d80a43f292a32ce80221ef60bd41c495898cf826db83aa

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