Malicious PDF — malware analysis report

Static analysis result for SHA-256 183cb8dc745d8770…

MALICIOUS

PDF

56.8 KB Created: 2021-09-23 08:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f56a5dd7679d0d103de59ae54ec2588 SHA-1: 6d938fb27210c210e755c59f9a0497b99cb90cc7 SHA-256: 183cb8dc745d8770cd5146d7746dfcc548f5922f27a76576cc35913099a1ac33
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised CMS upload directories and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely involving phishing lures or direct malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4703

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=audials+radio+apk PDF link annotation
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613711aa605e4---1793041244.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/gewelo.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/galugapabikobawetew.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/xepeto.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/83986301137.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/14eb866f8a335acc8cce4a747819f047/zubejunuxokuzidoduk.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7bc7f16eda69b457dfcbca6b1a52d43c/xiferudelezufobiso.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/39813648941.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/84842341916.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/gifis.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/fujurinuxofipezaroxut.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/keripunezajebodu.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/77074165345.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/lofefiwe.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614639777b624---zagefowalomekuvojobojeba.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/92773258170.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/sutimalebemamu.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/42789157059.pdfIn PDF document text
    • http://veitali.com/upload/files/6051241133.pdfIn PDF document text
    • http://art-ball.net/files/file/3932585590.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/xojimigutimorumiramubeme.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/vevizikemaf.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/kunebegekelibulajedever.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7c482572f---gisajenisup.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/vukodeto.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/98648179138.pdfIn PDF document text

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