Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa09d9f3cdac99a…

MALICIOUS

PDF

53.0 KB Created: 2021-06-02 21:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af00f35faa9f85da30d1407bc382fbe5 SHA-1: 0d6e3c49593dfc47d09aef08561690ef0334b3af SHA-256: 5fa09d9f3cdac99a74a4c6f0c418c47cd9a52a5cbe68215161f861e0c8d05654
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware. The ClamAV detection and ML classifier also indicate malicious intent. The document body, though heavily obfuscated, contains text related to practice tests, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6427

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://coretry.ru/uplcv?utm_term=new+michigan+ecce+b2+30+listening+practice+tests+answers
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4h81o2htqd659m8pk26969bsc5/99227508650.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/b4289d04aa3fdb3fb91c337b6481d52f/61729382632.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/78r2051k6kbujqo55kesh3s6t8/18433760984.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5a3ebdd7428c87d56f2476eeec0b0c42/tudovufomalotidapovepek.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5d9082ff---sosatipiserelevitotetixo.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609059485854f---7698917628.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609afd036f456---13735630842.pdf
    • http://zrdb-drogbud.pl/Upload/file/10533072504.pdf
    • https://angelsstaff.com/uploads/file/36012007512.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bf0d0580a40daf1fff71d83efe5b7908/13316577914.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9760defacba10c40f467f3393a975f44/74116642790.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b03b16e4d---bewejerinafa.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/26ceo5h7hi9pdcahglcotbs1oc/66160645372.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070846501673---41944013843.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6486137f829f33d9b1d750f7401f392f/65099844766.pdf

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