Malicious PDF — malware analysis report

Static analysis result for SHA-256 419cbb63db6c7d7d…

MALICIOUS

PDF

201.7 KB Created: 2021-06-13 12:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8e16a4677f61b11553b6464c4f17529f SHA-1: 2c198caebc67bf838a6c583bec51ff5ba3d09082 SHA-256: 419cbb63db6c7d7db0817781a4157adb3830df983a93f8c2ac970aea55d7ce71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to compromised WordPress upload directories, suggesting it is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the links suggest an attempt to redirect users to malicious content, likely involving a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=electric+bike+project+report+ppt PDF link annotation
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5be2bea23---varemivulujevofufeded.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7d29bb1480c42b15db898225e0388df6/jibojatega.pdfIn PDF document text
    • https://coluer.ir/documents/file/vajafuralo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7a0e92b16c4b99dcaba9d3a70a658952/bofixusudexekakukepiruve.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160966f491bbbd---99698339803.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6f250398f5ac46fe77c4fcb8034ef309/85557183867.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ee5e7cd1---60657237346.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/eec34bba6d193b4fd27e44732741628f/defada.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724ccea408d---fimevufevasetejavojumis.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c11c24d691b---40619169926.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/nivak.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072347fd93b7---zugezet.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/513844905c5d775b4825af7871aaf0cc/mizafix.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/24748309614.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608315ad971ac---95827555354.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9E2 4776 bytes
SHA-256: d7edb565da76d84088863f8eefb4ddf5b52d89cba543e30d74e9955446afd938
font_01_sfnt_off0002ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA3C 14544 bytes
SHA-256: c4adef1d1a90312e273d80a14f33d0442bfd7d8932584ca5d38ddb571df1a449

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