Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4052fb3119fc7c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-15 11:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd90f6a675ac9733df7263d8f889bf27 SHA-1: a6c7fa1b97bc617e0cbe9f3037585fe1a244d768 SHA-256: 2d4052fb3119fc7cff40efed48c8129cad85099c98c52b63988798894b0ed50e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file that contains embedded JavaScript, which is a common technique for exploiting vulnerabilities and delivering malicious payloads. Heuristics indicate that the PDF hosts a link farm pointing to compromised WordPress upload storage, suggesting it's designed to lure users into downloading further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141165783eeb---vopak.pdf In PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613593997bef3---44353100527.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/bj6c1ekghiq7m5mlbraum22n0c/benukigadukowetot.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/fegasiriwuvek.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/vawuzu.pdfIn PDF document text
    • https://koratspring.com/upload/file/91689109229.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vuxutejebelopimugixepuji.pdfIn PDF document text
    • http://dasbluemchen.com/35680322967.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/laforopepopat.pdfIn PDF document text
    • http://ewtch.com/upload/files/kekixejaxebogigij.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613401ac686b7---1476544279.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/55d9d1fbabb885c112303c98a030bdbb/zagolupol.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/h027mr62fom4imra68073r6c6i/lipapixatagakeg.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/nofagujijitasazif.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kojenibikaxutujosavabaxer.pdfIn PDF document text
    • https://protrialse.eu/files/files/56590946329.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/rupekavezagufufofof.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/jinoxevil.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/36396610283.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/15796453611.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/82622329360.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/sajufovadoduji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=everything+everything+pdfPDF 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_off0000bd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 10444 bytes
SHA-256: 340e89141110664886e9b5c0b751623d4208164760d35370df81a6e0349d08d0
font_02_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 17160 bytes
SHA-256: 2a0adbda0f015bb1fa46c77d17fb8ab5825e82d9f73b9807895c5dd65a93f7f1

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