Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca7a3cd2d66c191…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 12:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7916707c46286f5bc330e7e2e090b79 SHA-1: 209acd74eec32c6c497d0e4efd845f27ac798d49 SHA-256: 8ca7a3cd2d66c191238d927ead08c94680e52d65e0756c2c17921b04358c9ee4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to potentially compromised websites, and is flagged by ML classifiers and ClamAV as malicious. The presence of embedded JavaScript suggests an attempt to execute code, likely to download further payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kingwaterpure.com/ckfinder/userfiles/files/53548862399.pdf In PDF document text
    • https://aquarell.ro/userfiles/file/dabevokalaxexugezi.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/lusose.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/80831117993.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/26291203165.pdfIn PDF document text
    • http://hejia-ele.net/upload/3101415080.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161327edf3698f---53708066417.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/43145634336.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302d7a6f0e7---81028754097.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/mawokanelekuzunik.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614476b29999b---42350718458.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210912/files/20210912192835.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/futenag.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/40095700601.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161416493a0d45---58190414848.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/jewegobobokurufo.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/42896330833.pdfIn PDF document text
    • https://mfdesign.hu/files/file/36360829304.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/biwazematudotowerim.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/97175f48e4a744969c9f98f0c392a147/39081218709.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/takoz.pdfIn PDF document text
    • https://online-wums.com/files/files/44547951677.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/reber.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/maritabad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=can+you+start+a+sentence+with+onPDF 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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 10612 bytes
SHA-256: 011a52496d3967dba853f0dec8ec6571db21218eb4665e655725c9c2274966f1
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 17484 bytes
SHA-256: b0cd8147554e1707ae91dc494989cf022c210fa7b427aba733724aaf5a155e34
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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