Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a8a1003d4e3c01…

MALICIOUS

PDF

54.0 KB Created: 2021-09-19 06:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5068eaf6089c207b259f81c700623c45 SHA-1: c83e27f51b3b4714be163615896e72497a59dc9c SHA-256: 18a8a1003d4e3c014d94a95c4018d79075d733559707582dd071643a26037679
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination or evade detection. The presence of multiple unknown URLs, including one hosted on a compromised CMS upload directory, reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4587

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 http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303036537df---43870641301.pdf In PDF document text
    • http://tdbakademi.org/userfiles/files/96168838533.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/81756231492.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d942de4dfb---63016169992.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210919_996947485087C1FE.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/janadivoluwa.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/xilubu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a2aedab17---29718410223.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/lulizexenolunuz.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/vedotamufafojolisivizeves.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/jolinive.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/misusudat.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e52bde8b18---dereber.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/92906359130.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f285ae20b1---zikelorudalafigar.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/refakowivi.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210913235501.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3f4ebf34---ruzodub.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a82fab9f9---vakuzu.pdfIn PDF document text
    • https://apra.pl/files/file/tobat.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/24016325134.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109181609087942.pdfIn PDF document text
    • https://domilot.com/uploader/files/46649781652.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/81199965311.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146753eafe7e---48671506808.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135734259163---puverexatono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=one+kiss+song+download+mp4+pagalworldPDF link annotation

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