Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c10316961625b3b…

MALICIOUS

PDF

53.9 KB Created: 2021-07-15 12:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e787da3f323d349de958c9e7e09343ea SHA-1: fc10731e37e6500b8bfff57dac76e128ec6a57cd SHA-256: 1c10316961625b3be3b597f6deb0c8f64a25c73accc45c6ad03e82710c90244f
124 Risk Score

Malware Insights

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

The file is detected as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The PDF structure and embedded links suggest an attempt to exploit user trust by redirecting them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4912

Heuristics 5

  • 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 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://archism.ru/uplcv?utm_term=the+secret+pearl PDF link annotation
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e1d29aba9b43cfdec32c1f09854696fe/tikasakanezonuge.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57f0e46a5---gozubi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9cb73ce3ff8bc7ee06552fc54cca9e3/bopibimavenujexife.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4a43e26714f7a7b03cd672c508e27221/55552103041.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7f9ecc6b---29616968167.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb79706542---xubuvawewugobisis.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/9785139110.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///tasisozimasuxibajedifakin.pdfIn PDF document text
    • https://stopserv.ru/files/file/jazazaru.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609839d51b5de---83692126104.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/38496535295.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dmvnvuftv3bhundjee4mrpm7p3/biwufifagexisazu.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/nufuliludaxirakov.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/dimakileminimugaruxixe.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/zaxotititolulukajunoroj.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/95086785472.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81894d4ff---ramanugukurepi.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/11542824108.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/73707568403.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210610071326.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073115696cb9---15920886085.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a2e8b65003b1f62935a4552239663c2c/jibutepiwabegitopinavom.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/vaxoruvupijotedobipowe.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/kozomeveputatovuko.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12f6abb13---50148481771.pdfIn PDF document text

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