Malicious PDF — malware analysis report

Static analysis result for SHA-256 47df6bd5dfac1be4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 09:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bda4ba99cd75f1be2f5c032e632101c6 SHA-1: 6dedf0711fc25c90e51637072dd4009fb63197a5 SHA-256: 47df6bd5dfac1be425d34373bf1beb666e6db057b55812d08777ccd7ade501a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://omonetach.pl/foto/ilustracje/file/49827776243.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1a565f28---vozepojaxifejul.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/livoki.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/fijerakofabutigor.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072971c55be8---72672532552.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/jumajalokuleruvesevosag.pdfIn PDF document text
    • http://stromzeleny.cz/file/47226315493.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/40cb808b8b0a6f742719cd34b7509d75/pasifosigix.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/tiwipunenujus.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7c66152d---gupufomuma.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/84ec3e79284a54df681d479654b6cb1b/poragoser.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/51038187325.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/52336092581.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/pudatibep.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aedd68004---48272925657.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/84614571925.pdfIn PDF document text
    • http://bronia.org/userfiles/file/jizupol.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/55338901208.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/08f5f9fba2aaf55f6726c08d61025fa5/muximodigimijedozu.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/xobozaw.pdfIn PDF document text
    • https://airshow-bg.com/file/80088463657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=longman+dictionary+of+contemporary+english+6th+edition+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_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 11304 bytes
SHA-256: bf9c2b9a7478b39d86d05c791f6da864ba71b42e0f11dfce6768512d453c0338
font_01_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 18076 bytes
SHA-256: c8b135daadc79d6affaa0ce971838af1dff1df18493b8f8b0235c933fc52d500
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1