Malicious PDF — malware analysis report

Static analysis result for SHA-256 05288575e51b3063…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 22:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 97ca7b941fa70969b6dae3cbd78531de SHA-1: e9ccefc2b39d28fde6fb93b8facfde14252f5b79 SHA-256: 05288575e51b3063af15961ce8aa2ae6a03278306175be1d95cbe6514be41123
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of compromised CMS upload links further supports malicious intent. No scripts were extracted, but the document's structure suggests it's designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 http://tuanayapim.com/rsm/files/62026998441.pdf In PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a61d89819---10263875021.pdfIn PDF document text
    • https://coluer.ir/documents/file/36535086971.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/55117545613.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210831_D641B1E0E1B561FB.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/66113208561.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/tebawivexinunurubip.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3f1aeb79cf9fa05a513b076e43b036a5/82891476624.pdfIn PDF document text
    • http://fittbike.hu/files/file/56077874656.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f71e56be28---13847002512.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60ECA78D1D420.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/84390240224.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b48f2a8b9---potamidasigef.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/penuvomivebibafekovo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088025444dbb---65352468599.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/77ce22998f695f94aca4ecc7a9852fad/30033032731.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/65945776148.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/wowisusujuvisodesazibikux.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/87001209565.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85e2ef8ef---7943445197.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b234d568ab6---33196251975.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8ff8c08ca02fdaa148e86b9aff31ac0b/65382413818.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/porulipo.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/80355715296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=monografia+marketing+de+relacionamento+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/xonolife.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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 20636 bytes
SHA-256: 3b9252d285b7bf9d0df8de6b867421ef5b46faee5007d23b8bf925c18227b37f
font_02_sfnt_off000128f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 10880 bytes
SHA-256: 3b320d385effbdc71baa6a19e0e760a950fee56b5d1ebb522ac1085461301b57