Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30e550364b49e13…

MALICIOUS

PDF

84.1 KB Created: 2021-09-23 07:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e597797112441c8599b3a2cda3b109a1 SHA-1: 0c7037aeeb1d71e57afdd28b6ac73cb97ae09b28 SHA-256: c30e550364b49e13c682e62f0cd044144c71492763a51a14cba5a277f27ce0bb
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=sonarqube+for+android+studio PDF link annotation
    • https://tl-systems.hu/files/files/rasawejowifepu.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/28261399280.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/laditoposila.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/zedaxagujisasota.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42f58d8fa---13550965135.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c62c21c56---56923532067.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/88936545871.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/5472714952.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/deret.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/94064970619.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/janewu.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/52591742046.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/lobalaweporojubowubobikex.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a1e2030e---karujozoxolure.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/98060197130.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/xorewunekobonivemifuwapiz.pdfIn PDF document text
    • http://wohingltd.com/userfiles/47205517728.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/kotipuzawos.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614521edafa41---neropokinisopo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135190a41f9f---74852621323.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/34114782604.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/59753791583.pdfIn PDF document text
    • http://greenbrier101.com/userimages/86437132944.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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 22324 bytes
SHA-256: 53e68fe9fc5e1c14f4c138a99f4085b9c51bba5c20916ac2feb321d051acbdb7
font_02_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 10764 bytes
SHA-256: 9728e82c24f7f629efbb5c6400d3d492b0a7e69386a20e8703e2ab2a83f5c920

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