Malicious PDF — malware analysis report

Static analysis result for SHA-256 2067f82704fc362c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 18:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 617cd3f676ad0c6aa62dc90d1e561029 SHA-1: 4dbc2e6412a833d30a0ef2148b0dfb25f3304bfb SHA-256: 2067f82704fc362c4afb9dd177058c72f00301e7541656f8b5a28b5071bd6742
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a payload. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://geobigoni.it/userfiles/files/perekiganofuvikebo.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161287be9489de---20931427248.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/25725082652.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/xopigulakeloduboxab.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/50486651382.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/sgq9raci1dfvct5kqi27gsvdvv/13122140714.pdfIn PDF document text
    • https://diphong.com/uploads/42383931084.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/rugalokenusaziris.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/26825442952.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16082834b6a749---rodovexipotarip.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/jotogirofowavokivapuxo.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/83727988507.pdfIn PDF document text
    • http://ciskmv.com/css/file/lajipag.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9870f7ca01---tosekupetu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f988d3bbcbd---zeberabilurovajuduxot.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/27740797330.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/28216508899.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3cf5adaa---2657946280.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/vozalimosot.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c36005a3ed5---15591056638.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/528d86a1e68be93da14c6490f5ecb569/64772236129.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/jeregipavevoneno.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/98689091142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gymnopedie+no+1+pdfPDF 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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 19424 bytes
SHA-256: 5e0b230b01467db3197288bc36c1ef707e6e33a139065aa1b119d77aa9141442
font_02_sfnt_off000123a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 10288 bytes
SHA-256: 53d2a74fdaa6780493d26644616070b17e2ebfb3bba098f1de36fc0c9aa9049c

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