Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bd59e6b2140dbd…

MALICIOUS

PDF

99.5 KB Created: 2021-09-07 18:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd536af486b873205be7d50120b5383a SHA-1: cf0189cf14daaa91dbd0f650d95fff412c533185 SHA-256: f6bd59e6b2140dbd195b3a9b019d1ad2a901086acd59be05cb7332c1cdd85e4f
112 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised CMS uploads, designed to lure users to download files. The ML classifier strongly flagged this PDF as malicious. The document body is unreadable, but the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 https://kodcomputers.ro/2664/uploads/18791218273.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/17be8340af2ae8f7f67ca350355984a6/75717997160.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bolofizelozexezipez.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/rodavekozele.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/28396832249.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077da80944b1---11853788710.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/bijepuw.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/buvev.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/41e0860f91b28d604e6787b7ae540eaa/figisokaf.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f12a6639f---xovegowivinuwiwuja.pdfIn PDF document text
    • https://luminex.pl/upload/file/37118479333.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3ec0ff19bfc1d27d8bb25a0280272946/lebexisanofuvumugekuveb.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160e9475026e52---91172895918.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab6d4e406---24107694963.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/divamivufuxipijexejepajos.pdfIn PDF document text
    • http://ubest.ru/images/file/81732328923.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/34759044581.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/69637726533.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jnm9lsdtjvkp9gqt7f6g1cf49u/51742140673.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/28994400013.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c73fcfc5c---kavesepup.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/powanowasivumafaroleje.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/begosopoxudiwujigod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=2018+hammerhead+gts+150+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_off00011eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 11120 bytes
SHA-256: f3b9444f8d33687f283e8b579ad783030f040634a8ddbb9ba77bdb5d26f54cdb
font_01_sfnt_off0001386b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386B 18584 bytes
SHA-256: 08ce8f307dd3dfeac992b0c14f5184ca4ca5cf06625508a90f9ce923e536453b
font_02_sfnt_off00016860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1