Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfd4ab179994a66…

MALICIOUS

PDF

64.0 KB Created: 2021-07-05 14:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3d1c39c4013a77300db0f815d028f03 SHA-1: e23f2931e66981a793bb25b8bb860ce2ca55bc82 SHA-256: 5dfd4ab179994a6611b35537aa4c81f53c80833af22c8682b9f4e3f8c1d928c7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a phishing trojan 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 malicious content. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4986

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=elements+of+the+essay PDF link annotation
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803a96e6a05---xozazaxubirenumowixu.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/zemiseki.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/93208040264.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5bfccc72a5cefdcf74cda32616b2c121/kaziveval.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16089af882863a---69966469482.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/11691060953.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/901e2fc05cff0222455b3b28b7ad5eae/jewozina.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/4c97b85d069f246f462291469eb39269/2694911752.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/85076911430.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/4af5cc6436a3606481816c5626bee39d/80150526908.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/6147753971.pdfIn PDF document text
    • http://planetamama.ru/files/file/luwidowavobik.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cda796a985e7b23ea8e3849a0ba37f0/25049345841.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/difavisaminuvowoporeguzi.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/2387724994.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/83585277393.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2b1cdcf49d74d0b8faf4b0560472fa0c/ximujizavalo.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/gunilovesux.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9fef0c8bcdd8423d488dae2c647e0cb0/58074305034.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/42691324224.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/sotazibedez.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca7019637---midoxisedunuw.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3d3e18d9811adf8bdadc895f8d843011/82641308925.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xidapijonisorebebe.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jqtbiehrdq13si1vs1iccnvt74/69971400649.pdfIn PDF document text

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