Malicious PDF — malware analysis report

Static analysis result for SHA-256 27dd1ef87e4e30ac…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 19:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1bde0e45d97f2275497e1196c3c8fa97 SHA-1: 7d659dbda4f2cfa24d6e315e51e11274ae10dde5 SHA-256: 27dd1ef87e4e30acfa3defedca4dc1541f2e455042f637de04758ee569b1b0d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fcksa.com/ckfinder/userfiles/files/98684953374.pdf In PDF document text
    • http://pieseclimaauto.com/files/file/55901306076.pdfIn PDF document text
    • https://kawanmto.net/contents/files/marafajoba.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/qqlqksbvs9ju5sa3uecfs3ae75/beketukojezajofep.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/xalomusopepuretinogizel.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/jizotazurivi.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210911_CA7E7483878BB1A5.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9193ad8b86b518415faef7e0c794abdb/67014455076.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109131702305109.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146612e26a60---29865390882.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/49983939985.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/fimilujakimupebufuteteli.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e10560417---puvubenoguxojujumamudas.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/34151400501.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/wabizokafenubekimurivus.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/24b6de01f7f348816de8f8cad5906f49/93344791361.pdfIn PDF document text
    • https://miminku3.com/contents/files/pepiwonele.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/jisipolowaluzixaxerati.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/karapojisugokulebodemoza.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5d2318b8d280cb44375026f5adfc9cc3/tukesubovapoduxemaxeso.pdfIn PDF document text
    • http://kalikraft.com/images/file/74470736927.pdfIn PDF document text
    • http://scro.ru/pic/file/sedasuxile.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/nonuvonesidodum.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/poradefipivajekovilalez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=free+robux+codes+2021+junePDF 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_off0000b041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 10708 bytes
SHA-256: 25d92e26489c44feebed436253fbfb99a9752189c54b3dd285448225cd7d6cd0
font_02_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 16372 bytes
SHA-256: 052a8d1b13f125c13946c7403ecd7abded66f594ec06d85623fa17c8b9d486ce

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