Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c6bc740e5e0dc4…

MALICIOUS

PDF

190.3 KB Created: 2021-07-07 09:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f9661d2d97562fd713101225d5293c9 SHA-1: 53a82b6c41ef88e626bf605d0a64e25b754a7559 SHA-256: 93c6bc740e5e0dc429a0416467d7bb7323808307733f74eb6d443b8dafb701f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8591

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://synerhu.ru/uplcv?utm_term=r+programming+code+examples PDF link annotation
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a5a30118f---37994534039.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/p0013fvj88bhmhbhkn7vt55uvh/69962112864.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607448650dd07---10163822397.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608142bdcd823---pelav.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/fesupow.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/33171638203.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/68890862201.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1052c10e4---fezugazubowimizewinogugin.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900ee3c7a41---86924466526.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4b34330806de7d7470d7c75587cbcfbe/31032220823.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/7e97hbqvac5c56ui72d1eo74nq/tizenujogizugodafirileloj.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/368780794609d46d1f0ee5.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/65283640449.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/r3o0p8822alu3ncksgffjaeupc/gisupavazofirebixuvabozot.pdfIn PDF document text
    • http://adveotec.com/img/file/25886994740.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a865be46fb6---12274236641.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/40177227873.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843115532b8---73901695984.pdfIn PDF document text
    • https://mszukam.pl/dat//file/21530078118.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/82325034723.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094824c9cc4a---84871520737.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/teraleru.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4f7b3251---bovufuzokegux.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/lojagazakafiwa.pdfIn PDF document text

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