Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc27e33b7209c76f…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 01:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e09565639709f62593b03141793bd473 SHA-1: dfdbbde20e65d38765fc8bfd49015c0f2f2f8e4d SHA-256: fc27e33b7209c76fac8b589b8493d203dbd1fd0a4795931a9ff3aae1c94ab650
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to various domains, many of which are identified as part of a link farm on disposable or compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 http://ride.hu/images/uploads/files/gisesakuximakoka.pdf In PDF document text
    • http://mabo-meccanica.eu/userfiles/files/22957507801.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/34993200102.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/50490789732.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/dejoridavonavuzopev.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/bamedabixavadike.pdfIn PDF document text
    • https://amgaa.org/temp/files/60451129457.pdfIn PDF document text
    • http://theponghop.com/upload/files/98700451519.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/rixawowuloxev.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/2831537729.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/33479834762.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161355bab38784---69942019575.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/vusamagidaxofe.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/11259259057.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/7593527540.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/xamilupumuwufugek.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/satovimis.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f0df43c3eb6097470b5ec4922cba1b2d/gupiduxuf.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/39826944875.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161325d5351bad---xaguraxolakovofesipelazan.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/619bd691d2af890b42670f57474e19ff/xabaredimegupivimizubewez.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/nenewo.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/82457286357.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/92200886398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tiktok+lite+apk+downloadPDF 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_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 10260 bytes
SHA-256: 87855ba011a8eca1e890a7a673e41626b1b6c63f04f779a25f0fe54644556ada
font_01_sfnt_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 17948 bytes
SHA-256: df714c6d438d5063ca5d0a5ec51631e9b3aff5ff8bf7992d2883fe3248aa50fc

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