Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca15840ae997389…

MALICIOUS

PDF

81.4 KB Created: 2021-06-22 20:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 971c52e23800a88076b23dd8c16ceebc SHA-1: ecab6840384ce6e028d29e508a5bd58f437a0a05 SHA-256: 4ca15840ae997389e97d70fb6c8e0ec6a20988d26392eab6f2b4f373ad8b3034
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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
  • 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://acryl-bg.com/userfiles/file/19119652345.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9093a414a---kujaterodejoxisekururij.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/41029148645.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/rezisakegop.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/mqibdt15la4br3svm8bct2vi8n/48148438896.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83b6e35e15---modofujowaxolez.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2e7baa30---68263190279.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3c4c1ae9c51885d057a8c5a82fd4740/nenan.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/899a2b1daca23db2ce60b9cb48fd44ae/vetogibowerekatanebesuveb.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/pajiludizakunijeditu.pdfIn PDF document text
    • https://wrd13.com/force/file/namujufexirivukuv.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/p4k97amcehcs7n110jethclge4/vunedoguf.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/kitebexufitimi.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/37922207587.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/41979234111.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/gelovojiberojuf.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/a16277dgkhm6o45ijt4nmfjkr0/gimopiv.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/moxobixapoborexoxoj.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/61gqqrrk1npr38u5dpe40p5o0t/woxururefowepudevak.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/20735390599.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+pdf+perfect+honeymoon+novel+ebook+gratisPDF 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://scripts.sil.org/OFLIn 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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 6028 bytes
SHA-256: f62698442ac9115b2c6139c2cd52ccc48a01d51c2da34303b5f233dbdaaa921e
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 11400 bytes
SHA-256: 29b1c98fd0a7c78bfca07bbb97b45e01956fc6a74bdf51ddc774b17b1d9e8569
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 17112 bytes
SHA-256: 6b45076b49b6be86d84a40b194978c2118a3897a491ed468cc4aba30e6a82a30

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