Malicious PDF — malware analysis report

Static analysis result for SHA-256 531db89d620b459e…

MALICIOUS

PDF

64.0 KB Created: 2021-09-13 06:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9360b27c916f88a03b88203b710d66c8 SHA-1: 819702650b33ecffd522a88c47d2344054644796 SHA-256: 531db89d620b459e4c8957d6d853af233f7e8d1898b2146b934ac9b946ea7974
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5089

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://smidgel.ru/uplcv?utm_term=el+amor+no+tiene+porque+doler+pdf PDF link annotation
    • http://ahkkpcm.org/userfiles/38484853217.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/48426559862.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/48733902163.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/gefijodemikikowulo.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/4105674978.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/nezebuzusifekosofejowudat.pdfIn PDF document text
    • https://angkagenap.com/contents/files/xerojemivapisituxekaves.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/17301805701.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/vuxuzibosow.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/11450795073.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/goruwapekeboxoxafe.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/44643899914.pdfIn PDF document text
    • http://sakem.org/userfiles/files/zidotijulin.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/simodizakebupumamenoxizup.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f6b81f88---gamiluxegametosulil.pdfIn PDF document text
    • https://maria-galland.ru/files/file/59291147184.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/2303309642.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4bf1cb8d43ee90ae9e202ff14e82f5b1/86306469196.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/meberux.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dff8a7ba5---40726769736.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/sujefewelofomixudulur.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/lenunosizowujora.pdfIn PDF document text
    • http://sdds.be/userfiles/file/dilejebaxugo.pdfIn PDF document text

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