Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a62ef22a06cb94…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 13:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b7e23bc80158dcb15a88be362c9ff6a SHA-1: 1cfa3712c8be4b0864af34c71eea04c77abf42ea SHA-256: 59a62ef22a06cb94b434d9d8204b1aa751d640ee4f0aac8e66f20e472046de5f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a phishing lure related to invoices or payments. Several URLs point to compromised CMS upload directories, suggesting a mechanism for hosting and distributing malicious content. Although no scripts were explicitly extracted, the PDF structure and associated URLs strongly suggest an attempt to trick the user into downloading a further stage payload, likely hosted on one of the provided domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://annjulieskarpmo.com/userfiles/file/nubagavasiraxabimem.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmjok92f8si7u5laj2l1nkmu5h/bupareforubug.pdf
    • http://ddgasul.com/userfiles/file/zamakuratej.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079389075bf8---76090883395.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f028b9bac.pdf
    • http://auapp.ch/userfiles/files/tomubos.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c65d0a5a332---pefawidusuxefi.pdf
    • http://dentherapia.hu/files/file/46653756299.pdf
    • http://architects-desk.com/uploadsfile/55112154815.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/372e7485166bd3395a18fd32af03ae32/94227972829.pdf
    • https://szud94.hu/img/sajatfile/files/dumamogiro.pdf
    • https://123natura.com/stockages/files/bazapuwadobaguzubofe.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/1mk51bhfmpapeii10usvn7eos3/zozozazaraseme.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf669d361---famajinagexu.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4be6a275c2---10668843088.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sample+15cb+for+transfer+from+nro+to+nre
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 16792 bytes
font_01_sfnt_off000107e7.bin
544d53d6965b2dd7e3856d6042312e9b8bfd1bf9ea768459accb45d9dea5d9a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 16884 bytes
font_02_sfnt_off000133f8.bin
abe2fe7e3cc4a374b48b308fe285052cce03059da97de21aa99690eb623e49da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133F8 10952 bytes

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