Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ad644cbf852056…

MALICIOUS

PDF

109.6 KB Created: 2021-08-07 23:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ccaaf7c06e9b9b69e30e29fa3af416e SHA-1: f59f52415a52113d25c185961cea9a6f41f7e76b SHA-256: c8ad644cbf8520562dde2f832bdde6f5056018a9d75fa2ef5a43418dbd17a423
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious sites to download further payloads or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9009

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://ketchas.ru/uplcv?utm_term=advanced+engineering+mathematics+by+erwin+kreyszig+8th+edition+slader PDF link annotation
    • http://karate-talence.com/newsite/userfiles/files/23641015028.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/53007614931.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/bitegowiv.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/89131086077.pdfIn PDF document text
    • http://namngonviet.com/user-/files/17244571978.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/59660955764.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/84044918361.pdfIn PDF document text
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/70250761901.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd92f5c833---setukakipuzevu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8d3f38a9f---29485699529.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/karufevoperirepo.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/73701510180.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c66c6451986f0725174bfacd603caa5c/23907403170.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/b164c2a7981d6ee010e8c8bb016946cf/rutuk.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d581e474ae---rivaniv.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/5351312207.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6db317ce213ceee16f3fb2e7a76ead1f/suginurelogar.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aad327d9d7f---wabipexefipobijisufapok.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ba7c6d1d3---32837473693.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085986a0b3bc---pajoguzasufaxaparuxu.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/78212986749.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a9eedebe---71928432784.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1d37c7819e98fcf01fec5b91b0305be1/kasutuzilikafave.pdfIn PDF document text

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