Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e0238d4f5dd359…

MALICIOUS

PDF

320.5 KB Created: 2021-06-30 18:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ca80deda8a5e0e99c81c5094b44c373a SHA-1: 8f5d00c71d6f26ae9a08b5ece62e991b46866f82 SHA-256: 07e0238d4f5dd359209679aa7a6e67d6cdef69162cfcd7eaef777b08e6aee373
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to compromised WordPress sites, suggesting it is used to host and deliver a secondary payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cheapmarkt.com/userfiles/file/mixetilekokowe.pdf In PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607211f16d137---belivi.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a5b6a9f6a63293bfdff5d0316ae05b41/17538129978.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/h9bc4o44bjrbk0mep631f53b6m/73423855191.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7541491d00---59392967276.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c47e598183f---70545280945.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qje3ms3o26usae2gqf59v1kdt8/zodotaxibowezixexiromoje.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/s4klac85l69u80hpgp7oe3mrmu/musubijipojefazomuxonilak.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eab8e7577---64557219104.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/mowirisobabuveme.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-3/20210503200043227708.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/31507167690.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb36731005---87432937541.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae2704fbe---duvokovarirawidomofefufim.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087706b63ebf---60645895724.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/renajexo.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/27272548455.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/deneluwizolirisetubufuja.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723f47df2e0---dijivijojetisimamusewepa.pdfIn PDF document text
    • https://alutat.com/data/file/29950617676.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afce3410dcb---xajewasotovapagop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=aphasia+without+strokePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00049293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49293 10456 bytes
SHA-256: 929f3906c3cb72802285ffa5d68352232e1a4f48f7fafd6ff86be2f3d85435dc
font_01_sfnt_off0004aaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAA7 18876 bytes
SHA-256: 4b11d41e77ff1bc5f0a9f5c24356fd5cf001c16d7df21b89acf20646ff417f67
font_02_sfnt_off0004db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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