Malicious PDF — malware analysis report

Static analysis result for SHA-256 8775cf51899f578f…

MALICIOUS

PDF

52.7 KB Created: 2021-06-14 09:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a91221d5ccb999238a6588c375a42887 SHA-1: f969f64cf11c9c9c858d0b768d3ef3063547fbc9 SHA-256: 8775cf51899f578f4930f2d308dc4e797e3cb93d9a4f74b082ae95dc5d6b45f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with 'utm_term' parameters indicates a potential phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7590

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://nomylo.ru/uplcv?utm_term=gangstar+new+orleans+open+world+mod+apk PDF link annotation
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3a55f3921---radadofuz.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20788eb16f---58328786003.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/desumumamujalanemi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d2eb60e8---22936340501.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8eqve85n2mv13r13goi93vt6s1/bejuwuke.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d9af18e4be93e021cd897422804f8dea/70334560775.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848560b5c75---rurekaviferetixegaxesam.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/2706825396.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076314ceaa97---siwaxorinivupokaxi.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/pokojup.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/38547919302.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210509194735189.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/rewepajobepumeke.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/ranil.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d799c028bd---fefavuxijisekevesisotulil.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abfadd71aac---41353342252.pdfIn PDF document text

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