Malicious PDF — malware analysis report

Static analysis result for SHA-256 6735a4881d856291…

MALICIOUS

PDF

63.6 KB Created: 2021-08-11 23:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e483325aa169732f3f211f9b8525b26 SHA-1: 93ffcf828d51339dfaea8de874b69a7ad1d6e329 SHA-256: 6735a4881d8562912434e111d4375fa9db3c2bc8bcd47f1b50a55d1b8a85b3e5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to WordPress upload directories on various domains, suggesting a link farm designed to distribute malicious content or conduct phishing. The heuristic firings indicate a high likelihood of malicious URLs and a compromised CMS upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9517

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=9+s%C4%B1n%C4%B1f+matematik+denklem+ve+e%C5%9Fitsizlikler+ile+ilgili+uygulamalar PDF link annotation
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c071476e50b---88786617304.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021071222310152.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094227556dce---37343387011.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/muboxined.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/77033419619.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1ec48cfcdab6e7d0d6f0b7698cdd89ea/60498559724.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8096db796---98716885340.pdfIn PDF document text
    • https://ccskin.com/geektic/files/66326484450.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/65320753547.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/sonefakirilikab.pdfIn PDF document text
    • http://cloverdiamond.com/file/11106076870.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/mawatuvawozivumaruponun.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/xuvepozegiguwigibalut.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4933746a---31195854737.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3cbc8daafdf8a3cd2a4782a0433fb9fb/wagakoz.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-23/20210623225304453630.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608193fe1f974---suzijafinogef.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/7608198149.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9efb2a418---6951322988.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d37530b2---nibegadolowopesevub.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3413755ded---2014557151.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ad33bc21---16740820552.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66056a2282---81549437994.pdfIn PDF document text

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