Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a129b4292bdf14…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 05:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c899057585f6ece5027fd69d83a59bb9 SHA-1: 1b23f9e5c38a84899f9518df8d73db72ea029b8e SHA-256: 33a129b4292bdf146b95643f40310cd80effbf0630d8f8a3082a01911aa3c9c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and compromised CMS upload links suggests an attempt to redirect users to malicious content.

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://coretry.ru/uplcv?utm_term=one+time+init+android PDF link annotation
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613c501784392---9723652145.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/70422842067.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/wukevewane.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210906_1FC65938B23C53A1.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/magunabagobovezubab.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bab95f8323d607a6dc07e139a1e6fc14/84658127889.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/77240764446.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/zajiror.pdfIn PDF document text
    • https://digireg.org/upload/37434747329.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/61025592183.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a806beccb---31864886392.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/vifawib.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/99131015758.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/dc66de708e23304b65a6b590b9214093/jukovado.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210905_6E27419541B34FA7.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/19985161964.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f291737897---pubakoxarut.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396bfbdce77---78263099277.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/lesozonezirep.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/fetokarodukajomopewun.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/xijazibujipepujipuzazowud.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/repizeratomugupokezak.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a24353874b4d9d80c72807016ec757ae/81481183751.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/uk3r9ok094s54m9032dm6fibrk/jigusimo.pdfIn PDF document text
    • 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_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 17416 bytes
SHA-256: a5d3c9bb3dc5417c05da1548d0941ee4c1052a77ec7f2ecb2b0f75a9b3405f85
font_01_sfnt_off000118ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 10220 bytes
SHA-256: 4f71440d55c288ad01f5ba525c8a7a9435e47becaa6676a7983d6f92ac4d896f
font_02_sfnt_off00012fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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