Malicious PDF — malware analysis report

Static analysis result for SHA-256 9772b18e47a43d4f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 08:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f506df149060d027e3c6a7dd776ad12 SHA-1: 67091ae4db5abff25f09a6e6d0d9202fb0b9e6f4 SHA-256: 9772b18e47a43d4fb004b751c1f96ddda43f5c223620e248044dd7248a32ba3d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://collectifff.be/imgdb/accueil/files/26358808067.pdf In PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/wujixabulozisom.pdfIn PDF document text
    • http://zubrcup.by/files/files/11278539266.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd93c84b007---70907919604.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/31265699460.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/54483992141.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c29de133d0---94611383136.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4fd789302a99591ec8d68415aa78dd3d/sumexirolalomubatub.pdfIn PDF document text
    • http://naucseto.cz/storage/39265344877.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/35381058374.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/tadezexenutaxopabosaru.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f539ea01---bobujaxibalumuxa.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mvj3oocl4sisc93rup50pf6a17/7597143232.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/36214766232.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/lovibanenowovusijo.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zokawokozetotasizefuz.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161062ceb4dce3---nokasudun.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7be231ba7119e69fb51b2cbe44d80e61/90752723590.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/6597769943.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/bevofidod.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/degereropeguferavawe.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kfdgneg3gnrk04msqp8c8ps29r/74829367106.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/76420252137.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/71406734910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=docx+to+pdf+conversion+javaPDF 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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 10868 bytes
SHA-256: bdff7ab597b154aab00af7d62736c5f19de4288e7549534e55c962162493016a
font_02_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 18552 bytes
SHA-256: d4444c7d6fc9e39dc03c3dd764b7829d9aec1ec4fac939570a4c91ca2f2c21d9

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