Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9a96204376b6ab…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 09:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 23575eadb30f1563f4433efec5627884 SHA-1: 19527432aa1a9f7193d28090276b0dc28f7f6fdf SHA-256: 9a9a96204376b6ab2e72e48ccf97111bcf18b09d9fbed3228b305c9043c71763
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links. The file's structure and numerous external URLs are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fullcolorspandoeken.nl/userfiles/file/28792685232.pdf In PDF document text
    • http://flirdining.com/uploads/files/87687497235.pdfIn PDF document text
    • https://papiratisk.cz/soubory/90906207036.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/36309484748f006342b54f785340e8d5/furipafojal.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5c886d481cf3d687e65d4a9bc6a02954/tujorojoxetabejeras.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/titeruvejizupagetemesema.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b39e0e64bf6---56602489426.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e98c8cf50c9aa6be0690375ba2993a72/70467928231.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/lofofuximoperiwaj.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fc0eb76d5a3112748de52f56a2de374a/23609092566.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/91577154374.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/88625082606.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a20517bbb01---82173682961.pdfIn PDF document text
    • https://poker-fire.de/file/46083022927.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9e187f65ca633967a8e7d626d0785634/webamilejiwovorezup.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cebaacc81cf---95491461261.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/17881965057.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/niwotevedilagamadofizu.pdfIn PDF document text
    • http://talleresjpg.es/img/file/82511734288.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/zukimepisawatolovodix.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6ee519b8---38450361253.pdfIn PDF document text
    • https://edarky.net/data/file/zuderazutim.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/59602059604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bible+verse+about+worshipping+godPDF 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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 17800 bytes
SHA-256: 3234c2c8a5e4f6192cd82a78a3ef1d23514a3281787491fc5b7fa2a25801a81d
font_02_sfnt_off000128ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 11116 bytes
SHA-256: e5928f1694c2422c66ac64ff5e2a2f8d7964bea6ae8f8c4eec75c09d8eae79f3

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