Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5afa36d6827249…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 19:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7782818ed68d7ee496ed3a64be6deb05 SHA-1: 19542a27b28c32af2b3580ced1c374a515580572 SHA-256: 6d5afa36d68272495b110e36744ebf9801801f6b0489bc3a48ea4f2b7257743c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://rhodium.vn/uploads/news_file/zizuzelurukuzu.pdf In PDF document text
    • http://alituncer.com/userfiles/file/6702089189.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zesemuxinasawa.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/pizimubodomeruronuraxe.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/danizat.pdfIn PDF document text
    • http://islandpointfl.com/userimages/295270885.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609644f8a5eb9---wugaxivurunu.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/xupevojakufonawow.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2a1ff3562fc428956e66321a25823c04/nuliwoxon.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210801_61FDEC540C992C9C.pdfIn PDF document text
    • http://ahchala.com/img/file/sobodexasobesenofu.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/74595265817.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/mororuburizule.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1d633c34---jurofovetiwadif.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca42070c1a---37160301709.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/46610496193.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4vkakrvj3uf46ibtd4lpiotqs3/pezozoda.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/lumak.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/58615038381.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/85911334360.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/78351524499.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ddc19de3---nilurapevenoxonatolar.pdfIn PDF document text
    • https://stauber.lt/images/files/xomaxopoxose.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/bejiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=daily+thanthi+today+news+paper+in+tamil+coimbatore+pdf+downloadPDF 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_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 11224 bytes
SHA-256: 868a64a7a8fdf6124b100c5765ebfbacd496e9129ff57cf1295e83ee545df012
font_01_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 18496 bytes
SHA-256: 6a8073429e2adb5ca9f0802961b9787eff4e66cbf279bed5140ff030a6614b85

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