Malicious PDF — malware analysis report

Static analysis result for SHA-256 6983da781743f544…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 17:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35147d6f2526761b7b87fbcacbe2bde3 SHA-1: b0c65c3bebb668cf9a4e44b3b5e911183d91fa39 SHA-256: 6983da781743f5440a0d62b44afcbbbf8b35df7049d66f035fbc0bf8d097420c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting, designed to trick users into downloading further malicious content. The PDF structure and link farm behavior suggest an attempt to exploit user trust for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://e68momo.com/shopadmin/upload/files/19305801006.pdf In PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/satiwov.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/7eb4a633341cf67e2fbe4a76e77518f7/fudozula.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/sciutkh3mh15qa9g5c72vt0kp6/vavotobifabufadedi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7feb9a6ed1743862674275efbc5bca3f/takizusifizurek.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/17262585851.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/52344078188.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/fefizoworam.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/61411375896.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/loziwu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1o3tms0tr69bnktspicq7274o1/27861873258.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856e2f244e5---lutepiduj.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/namasugusasapasulekogaded.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/faloxege.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac5c3b4e76---42504838238.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bb104065aef---rewisobupenowawuri.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/11903203740.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/geusosbh5tqaopf2mqrieegjp5/93284467912.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/98134411004.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/xagagarorikosu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/giuk11o4sokboim8a5lg8pg773/tujetajebiza.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/tulukiwofadazevafepope.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75834836681.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/37429675643.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9jih8qt2ob121qsujtvijncboo/20825792331.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/62942394024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=zoonosis+adalah+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_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 10228 bytes
SHA-256: c33c000ca97bc5e9fb8c0cc80221c0a5655963ba96b7c691c4b0ca397bc316d1
font_01_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 17224 bytes
SHA-256: 0110b43ca00b6f7858d1fda4c13545e64968c68b5ae4a3984bfd4788ecdeaa4c