Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed6da7c53127019…

MALICIOUS

PDF

87.6 KB Created: 2021-09-08 02:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f20d445d0ff973e913571bfee4e5b664 SHA-1: e6abe49b2e463063b323aa877b27b382cf98cdb5 SHA-256: 7ed6da7c53127019488ffd29383b7135e503f93af5f52543aa183844d504c0b4
164 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 executing malicious code. It also contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ovliv8dnpfjeqhmh9qjljg9t42/63974343328.pdf In PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/lawepabufa.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vatigufejazanerijoxeju.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/2098342906.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/sibusubepapidasovofodix.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/teweketakotemagakenebi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd3cd5835---dapiwuveditijoxuf.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaa948345f---jatepali.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/35438528008.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ff8211e758e9983bd4161d6743ea507b/fafukijalirulasakamubun.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608724c055d45---buzogubudazosirem.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/fizezomefax.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/rl0pud2jtd0cgt92idnt5nhsnc/ridurilupovesurig.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/11bf746d0c9ae4e27e1730d7a46cf21e/lirorimunidinobanupeb.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/jezukuxitejegizatunom.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/587f5c8e4e22e150408ea016026b253f/62307500295.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/6733302605.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/10211680395.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/napisepub.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/1757f09c6b0ee4f5368deeda427ceeb7/zosagepetodudu.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/nozezoporeseto.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/74c7cd22b7ff1340e5596e4cdcbc06f2/sulukuwamuvuvajaboludiwo.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/bixunabanebop.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/62695031777.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/pujajobogarazuli.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608294bb605ad---77913006261.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/pojavaniragi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=vulvodinia+tratamiento+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_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 10624 bytes
SHA-256: 2e9e6f6a622a4561b4479a7acfe2daa3785cf947bbf2116f239250afeebafd75
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 19772 bytes
SHA-256: 843d56cfaa3d7be85876b3ef369fefc12c0aacd19bd5b684d230be0d25db7803
font_02_sfnt_off000138a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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