Malicious PDF — malware analysis report

Static analysis result for SHA-256 260c227a4c3fc623…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 22:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55164bce10f1b5aa390e46f9ae991d61 SHA-1: 3ba6893d496c15302271ea51070e5a29db546f08 SHA-256: 260c227a4c3fc62364c284adc700c3a927017856a67aba6085497a1a31c9827f
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a likely attempt to distribute malicious content or manipulate search engine results. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs, including those hosted on compromised CMS uploads, supports this assessment. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://ka-base.no/images_content/file/saputozuwafupogajeta.pdf In PDF document text
    • http://khojedu.net/userfiles/file/47055052205.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1bde76e4f57e56d03811c87cbf9bda6b/11939759590.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9c13aa8b6a9707f36da403ce70532e30/porelexuguxekoz.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/la6bs5lovtrpbjg24te81ir4rn/komawo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06911b73e---zixewedegokoxowumikadabaz.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a960def0cf5---62895028288.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea81e5fbd---vivaju.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/36387643129.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/sobigobomomuxabiladupap.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91a527ebc---14791976266.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/35845909899.pdfIn PDF document text
    • http://momsystem.ru/public/file/34708354010.pdfIn PDF document text
    • http://temple.mo/userfiles/file/32264168680.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/27689199512.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4b6b81ff436e73623bd300b3fa645309/50574058363.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/pudelizewekokoso.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/pulerirerozin.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/82340315244.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/xediwazux.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3a6d3ef030da179b394bdb023aeb0e82/xurobosa.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/jukatarosegoruminez.pdfIn PDF document text
    • http://merwepizza.com/upload/file/sadomapiruwodazazodibev.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607961b56ab4a---96901669625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+witcher+chortPDF 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_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 9896 bytes
SHA-256: ed62cd534113c7360ebdeab29fef5f87e150d55aac9d78b3fae302be6f461bfd
font_02_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 17200 bytes
SHA-256: 35a062b25d6298c893af7b405f1cf07b1b34df512e3c9f0a6dc7dd8da5429de4

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