Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee9e0498ce3175a…

MALICIOUS

PDF

92.9 KB Created: 2021-08-15 20:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d8f21cd3dd1cccf77643a7b3f3805ba SHA-1: b834f1706189aab00d477a9770ddf34398589043 SHA-256: 5ee9e0498ce3175a256f8631617e221fa6f4e7b65d247511325adfa36d1e3220
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the extensive link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://cructi.ru/uplcv?utm_term=how+to+find+the+area+and+perimeter+of+a+quarter+circle PDF link annotation
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/95b2b4c04062661ba20cbf2fe8240c1b/ruxoxizofofamuvikak.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/89230438089.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b661ef4f---felopokefipimavi.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/84299931494.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/figekixupi.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/fipuresonimexaxosanife.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/votaziwuwolemodil.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/bubaseninibunevi.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99547cfcc---59373662479.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/beneserapugisuko.pdfIn PDF document text
    • http://simonide.org/userfiles/file/74970288625.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/78369780358.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/3409586224.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9f48e565bb35198d137575e55cd87a60/dologisozavezutojiv.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a233ce0d7dd---59750988196.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f6a01ada---65915215128.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/801c6c4c7428c96d55ea3aa2e0714452/jofir.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/67557299498.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/wulafokilis.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6cda89744---45174452113.pdfIn PDF document text
    • http://proxima-design.cz/files/file/tugafobosopamodutajexoxo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/45646498219.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/95159007752.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_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 18188 bytes
SHA-256: d7defb3f28284173c99f3c0a748190986c101cd9f65080b63398742769770933
font_02_sfnt_off00014b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B35 11040 bytes
SHA-256: 09a5e608f30398e866f26db808a4ca80f526ea333fef96af6be26e8161ecc699

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