Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0f1cbd53b93334…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 16:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e73df429ec82c1d37310b9f7d0628dd SHA-1: e99502ecf39b0b7f303054ea40843a58aff7571b SHA-256: 7d0f1cbd53b93334a0a4a85053d4baafacd65f42deb708f7478fca18128bb66e
104 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also flagged this PDF as malicious with high confidence. These findings suggest the document is designed to trick users into downloading a secondary payload from one of the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160766e856990f---53989953343.pdf In PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/turudelivufiwomaxisa.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/oco9h3q0rgglsscconhtah6t49/barimuririsoda.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/93241818228.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/8120852844.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8ce328ed---91009017894.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160879b5111534---8054376080.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085836edf13b---wofaj.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/lomumexa.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/29e4a1ffe46c2344ede8293896151f12/jugowiwurikujif.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dc72dbf963582b18a5297bedb5c8a8ab/86967304118.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2623bd01db---53250105262.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ragmp7jev6ua0vnkda8e8lt911/16973417247.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/laradebubajafibexaruviv.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c868307b1d---91257605674.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/61327520079.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/sv2002i06qgoc90nvu8tp06biq/mibepawul.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609454f7482b9---rufajusug.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607560c58a893---joxug.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7ee17e4fd6485754f2d67910b17ea929/lirogewirigusejalawuxilaf.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xopijefilazopef.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/77952740965.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/508c8098035944533fcd12d41d7854e7/158017870.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/a81263519d85351c4d7896e1bada915d/poxuxepizi.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/38843529214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=samsung+732nw+service+manualPDF 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_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 17264 bytes
SHA-256: 85bcd04137f191f8c15f806edcf7090e211524d333a8aed5f0c06031176ea1a8
font_02_sfnt_off00013503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13503 11024 bytes
SHA-256: f0e094c33187401853ed983bb486d164f2b070f434d233bd2cbd472b88421d9f

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