Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb59e9054d3aae1…

MALICIOUS

PDF

81.5 KB Created: 2021-07-04 11:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cc5fac6910a1b6b225c1b5f2282398dc SHA-1: 5f58fed740ba5dd7d93dd23ff0780096397f2f08 SHA-256: 3fb59e9054d3aae14553cbdfdf2602eefba7f5c548b5667d961459ede7712b2e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs and link farm heuristics supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kipass.fr/userfiles/file/jenakelemesaxo.pdf In PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/f0c271ac6ff4a1ed2c475b5931a5e581/somuzoz.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/j3bfjabrtplqsnc7bdrs5glspv/bapemifegowexewamajop.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/zajonowugugigobatufamija.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9dn7m6il6vtkmgpgfsauru4d3/tudew.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9f6211d43---namixevumomevosajob.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ji0071l56hntji5j27u74q5mjj/liwawowexutezezixepegikos.pdfIn PDF document text
    • https://campermagazine.tv/public/file/gutevuxis.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090f602358f8---gaxepajusesinasegazeb.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/f44956739be41c380254f68e2f8271a3/73461030068.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/54222325936.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2545c0cd---16827213782.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/tifozerinegisojakobefefez.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/fanulajomalijuxu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c624a6f0991---51882425463.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e23d02c34bc8a73881c94e51899950e5/29183721365.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5e3b7404f4c509401e6d4ed6619c78c3/junipe.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a8f2694cb---rewozovalilikovekuxerefe.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/nexelovowubuwominux.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/10a24b102347e215f32b58050ae06d0d/10858267901.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d79c0f51---pozavoralezegemokupos.pdfIn PDF document text
    • http://sam-global.info/files/file/5838931351.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/2t6atfd7fkr05m4ejm5ghpsip7/47153685962.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/xisegemetaripo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=non+representational+paintingPDF 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_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 16696 bytes
SHA-256: 22e4727d0fdcff50109526d21d46adecf08040d2d5f003c2ea0b69dc536d4f7c
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 10404 bytes
SHA-256: 688e35ed1790e6202cc6fff90a10a7bfcef8e582bd2a263b2babbe11bbcfed35

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