Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e743135b24594a1…

MALICIOUS

PDF

84.1 KB Created: 2021-07-02 23:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c555270b8091d3a5beae3589a0a15337 SHA-1: f613dd91a0ab86773dd9cc1e6cb1f86a8b588f42 SHA-256: 4e743135b24594a16e0eff26177e002c8227e173ce62360557179a95634d9374
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a phishing lure, specifically related to invoices or payments. Multiple URLs point to compromised WordPress sites hosting PDF files, suggesting a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://bloemenwinkelindex.nl/images/uploads/wurekukepopo.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e4286ad4c5665eee600d860a08d83854/lasedodalikaso.pdf
    • https://kodcomputers.ro/2664/uploads/61799696134.pdf
    • http://studioarclab.eu/userfiles/files/mixusajux.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af997c2b028---81617479090.pdf
    • http://gillyard-johnson-mahoney.com/clients/62114/File/15003953237.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8f411826144aa6a3430b15c936b6b5d5/90598590976.pdf
    • http://vksraja.in/fckeditor/upload/file/nujek.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0268c10f32b1212c5480b44fb9f36905/faxekawoxaxawu.pdf
    • http://newgrids.com/userfiles/file/viluwukusil.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6f81f29ba97e1be9435a39d5bbb040a3/32934044888.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/6a9sfdrtnq1earf91r6fecokcp/pozigifepenas.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0brdcm929uqcvedu6quekh6ml7/terab.pdf
    • http://hanhthien.net/uploads/file/bajilolenevukuxipado.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/dfa8f931f825e2ec0d9729c791dcad4c/kakadiduzavugu.pdf
    • http://goldway.jp/upload/board/file/37593933961.pdf
    • http://samafb.org/uploadfilefiles/17339999511.pdf
    • https://coluer.ir/documents/file/dofifujozunisafupuwile.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6938f4e616---36816166786.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606da634476ff---59002657374.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9b865f11adfc3e5bb41ce3e69122a5e9/patejavezabilosoraruraku.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ca20c41b3c3f0aadcefdf26860f4c04f/jamadokit.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56e1d21c7c.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7659f0013fcbcc8ef02a052e5aac5848/14425965187.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=manufacturer%27s+statement+of+origin+for+a+boat
    • 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_off0000e547.bin
688178b6c1f17da0ebe4818c56284d5a5b45c7eeb35f216d7116482a7f9bdc25
pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 16892 bytes
font_01_sfnt_off00011172.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 16792 bytes
font_02_sfnt_off00012989.bin
81009131818207ae9350eff2250897971f34a1b85120003313d5f81821601e08
pdf-font-stream PDF embedded font (sfnt) at offset 0x12989 10900 bytes