Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e459ab3b5cd36d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 13:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ffafe86dfe3feebe7c289076e392226 SHA-1: f11fac68c48ac8287abce6fe03806f432b628542 SHA-256: c2e459ab3b5cd36d26be63b99226e2c44abab223e3550213cc9c34b85f407843
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's part of a link farm hosted on compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, but the presence of numerous unknown URLs pointing to compromised CMS uploads is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c716cea70---buworesejasikewe.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6c7b91dc---9886914481.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/gojozewovodedul.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/farefomoxiwul.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/bunadoji.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/35534294666.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/36975201799.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/67103505520.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626519429.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-8-15/20210815192141678553.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/77952432992.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/23147814391.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/dolapitujilo.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/0a16bd021d5377090373e8f6491033f1/17127941110.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27e106e8e---bovejajaji.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093194679f7b---surarijopisupolakexig.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/89254891238.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/luzekisedubafunexajakufa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f706299c1---kikogisigabizotigojufowo.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/vanovudojufomuwe.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/64968297104.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/c10f7994a9932918ac48dfc81b956af8/18038652758.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/18082601166.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/96e6f05e05db7189eabc9090e6a57796/gepurajinarunejoturopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ketone+bodies+pdf+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_off0000b500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB500 15108 bytes
SHA-256: 8da1842115aeeae87a5064a3387da3eb61b63f3adef83453c8c24928dcb83b3f
font_01_sfnt_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 10608 bytes
SHA-256: da9801d58b11df38f0ecf39ce7bfe0910f300399750196df46dbaf1df0f0f4f3
font_02_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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