Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d917e746002d769…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 08:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20e8c4a50a9c10ecfb3ed6e1c97498c3 SHA-1: 4a06b15fcb23c55fee501d7d646c1a9bb2062e84 SHA-256: 4d917e746002d769168c6c5c859ed19eaeb56a30531f4b27cc1b2ac099f9c77e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://mandarinusa.com/userfiles/file/1630554338.pdf In PDF document text
    • http://serextion2006.com/js/upload/files/60893419344.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/bimeputupafimixagilagixo.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/98143600068.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16131b94120f1b---mukutipafoguto.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/kaligibabup.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/119477af2eb00e1d022fbaed1c743ed4/55817006475.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/xuxibamovebura.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/duligiz.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/zomesonuginovedop.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/sedemezukutewomoni.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/12455528690.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/58022800393.pdfIn PDF document text
    • http://baove24h.info/upload/files/48806537321.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109050051159840.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/rofudulobuwu.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/milubal.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/37504032059.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/nixip.pdfIn PDF document text
    • http://preiss.at/upload_files/files/pibawuxakofikufij.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/78330671653.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fbec66121---85997558809.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cb1c0edca45c68edc73751d878880a0d/konawuvedugipokemofigeg.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/84899252249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=taken+3+fight+gamePDF 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_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 17080 bytes
SHA-256: 4e953850e70f10095cc1b0e94f72069bcde56a6391d49cb55185fafaa02c9d9f
font_02_sfnt_off00013128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 10456 bytes
SHA-256: f623d45ce3ca859aa26fdfc4b4b2912e770337551f130bb5cc97cd130d100b9e

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