Malicious PDF — malware analysis report

Static analysis result for SHA-256 8146b0c6f24e23f4…

MALICIOUS

PDF

303.1 KB Created: 2021-07-17 16:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 71f9060bdcc0320197dc319b8f5e0016 SHA-1: 655393fee681af291ebf81f519e02e386d2ba9dd SHA-256: 8146b0c6f24e23f4723e40ddec583efadd431457f4238f2693dd7c464869d03d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and a machine learning classifier. Heuristics indicate the use of a compromised CMS upload link farm and an SEO redirector, suggesting a phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall pattern points to a phishing attempt or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d72f86326a---2249338318.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/413vqs6313o940ojjhgrejdva3/xelipofefem.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/ruvonuzefefetu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cd4568e4e66276634ae8cd2017af1ebc/35606417278.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/94713989163.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/07c2a027f5cad6dfd5312eb8321be8a5/devosumigiva.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/wegaxavitejar.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5c54b9da---40248968654.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/c5m5u29csirt66jtlo9pdkq9go/20842419730.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160946951587d6---90540413480.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vkkecfa1tlahu4dvf0vi1a16n0/gelibuvivapepawesamaluri.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2577ce7ecc---2493774410.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/pizuw.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/23824042565.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe0d4af192---vamomujebezamesulize.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080d89c3a39a---24890918053.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/28243510687.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d643d8dd6---sezew.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/nutomugevazowipiz.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/zigatevesolitorubag.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb0b21c72---34275972129.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/18917185807.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/tonajokagugitapomolit.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/97551437504.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e145a5124c---vezeworasirotulexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ciaphas+cain+the+greater+good+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_off00044d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44D3A 10884 bytes
SHA-256: 38df01a0b39538c6d0022772a0511f232badc560f84c966fd29792f10d9879e1
font_01_sfnt_off00046630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00047e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47E42 18352 bytes
SHA-256: 300cfecb225367f47976ccfae83ce60dcb71cefd824ff354c9412dc722b3963f