Malicious PDF — malware analysis report

Static analysis result for SHA-256 f343a4e8e51c6a49…

MALICIOUS

PDF

93.4 KB Created: 2021-06-30 10:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26b24232a9bde1c23249dffb92481d4f SHA-1: d1392fddf13af0ce0f9a4f81b28d9fa343a7bcf6 SHA-256: f343a4e8e51c6a4946846816f9e4f9a01ac919caab2e8b98704bdf7543677d10
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://area34.info/wp-content/plugins/super-forms/uploads/php/files/10m54mn7m6m2gbigt8r0gbq6n0/6615285136.pdf
    • https://wecareprogram.org/images/file/vivabi.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/03e3cbdb557da7e8f9be3f40731d00c4/75687579339.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf48f2f0c---wuxutapotumadofomugo.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9aa21c9c---runenoj.pdf
    • https://webtechnocrats.com/upload/file/jiwijarirumo.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/uebp2a4mhgbg71vhu40s5hnqoa/wokopisaj.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nalep.pdf
    • http://biosite.ru/images/news/file/tokeremil.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c6953171d---bidoxudalurovaj.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/21192083261.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7348c116---sofapijegibapevataj.pdf
    • http://leaguengn.com/userfiles/file///mezofagixodadobozi.pdf
    • http://hevolta.com/upload/file/42264978063.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/pipizuboropejixi.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa92352fcbf---vaxizexasipanorixixiv.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781cc659424---84924298528.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f3a1fcc2b2b07c9282b76011eea6625/wemufelimitesaxobimenuma.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/958e9bfbe9f6cb467348a3759026808c/4072728176.pdf
    • http://dent-pro.cz/pic/file/69354843440.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/n3n2rc1p00qf2v4v2d560oim61/pubudi.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/aa81ba682ae59b9912a8a7da110c0102/16219262761.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/07685468dc81636a4fb81b8e12f4057d/gogipu.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/1fbdaeee7ee63ea693e01ac38c17e738/44138335050.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=semiconductor+physics+btech+1st+year+book
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 16792 bytes
font_01_sfnt_off00011ebf.bin
9cad24d11d7fba89a853c9bff81aab7336f1d87174a40d9cab95565c1e3ab8ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBF 11304 bytes
font_02_sfnt_off000138f4.bin
eace2bbfd475e4da257e7f3cf3f656e14373e97cdd994a1669f89f4a7f0863c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 17972 bytes