Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9f8eb1c93b2e38…

MALICIOUS

PDF

101.1 KB Created: 2021-07-01 11:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2e818874ca64577642135b526f41c352 SHA-1: 9d2e5fc2ca445167138e86ed64a33a58326de6e4 SHA-256: 0e9f8eb1c93b2e38422cae59fd0ed86f7cbac1a00afd357821789af98f0f74cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple compromised WordPress sites and other domains, which is a common tactic for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute malicious code upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://gunjanjain.com/app/webroot/js/uploads/files/25819712613.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/38ab4ab62b513824b6e465196a567415/50695244231.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/49249875753.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/keziwowan.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d1c98cb2---diwiwekevozubaxunisosere.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5399276e---7052573108.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/94599989259.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/13031023976.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/21012145719.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5dc00394cf334a0b128790a4e246b2ea/zariwomomebifirifawolali.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/42329194631.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9dd30cdaf6b12fc7952e2c137546dd1c/17387373897.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/367988107d30bb8f1e84556035b047d1/37769894800.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d5f79343d---11010815254.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3654bb1b4e---5822220665.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c7b372bf91a4fcd62118ca720d0a421d/24887552754.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/gawibara.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ccb92823c2b24172f9735153637a81f5/zusoweragikuvufutisiwuv.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89f1188cd---zotekefafigumumomuzuxibe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d0b160babf77e3b8b3324ff7654a7e5b/33017476273.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096c43728155---wivegibififubiso.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/12d69a1f25e410e0c9ca2d43dcffc913/lezirupujeniru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=words+starting+with+riPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/10678325257.pdfIn PDF document text
    • 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_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000141a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A2 17760 bytes
SHA-256: 0273b8d1c145a7dbd3e9622ecef6fd93aca017600e46a8750d837eb85b531432
font_02_sfnt_off00017017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17017 10428 bytes
SHA-256: 5f395ddf49e0e83f3c6e1d9fc9466904abca16fd96d75c6fe13a67e0cbb6b728

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