Malicious PDF — malware analysis report

Static analysis result for SHA-256 7588d33c2f7302ba…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 01:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ecab009a508992023f6d175810787116 SHA-1: f5cdbd2e203b49162ed54043b02aff39fdffbe1c SHA-256: 7588d33c2f7302ba8e8b7b31165d003f47ff0d1f7a773d2de971cee4798ff43b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads. The primary purpose seems to be SEO manipulation or directing users to potentially harmful content, rather than executing a direct payload from the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/8fbprlr55g5kiuflt91ga1s8g5/98686802060.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1788edf12b1b0ce3c0c28dd8875889d4/51525743412.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161032d82cb9a5---82671736244.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/n62hpe2agdtv37leoa3fr08t2o/16857829795.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/guxoludawabuzejijowitelot.pdfIn PDF document text
    • https://samtee.com/admin/images/file/73638613043.pdfIn PDF document text
    • http://letdentalab.com/img/files/89262637898.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/89951495458.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/pusigunafi.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/65158448902.pdfIn PDF document text
    • https://digireg.dk/upload/zumigubatuvowiwowojulaz.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083600f622e4---32179232677.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/zumoselojurukagukeruto.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118df7f2bb28---nosabumugamesibudox.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9be3de542954075cf1c5a1158970d314/xeraraxelosazebabekado.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16087a9ee5e548---xinufekakaguref.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/wozafalegepirotejosazab.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/momopexived.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160942787ac24e---geletozusuka.pdfIn PDF document text
    • http://araonline.hu/uploads/file/balurimiwipebozabapu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/75d5b4dea3845c6f304ba6cdb5e29ff9/2835211288.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/84773298246.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/99070357218.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/fukevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+find+area+of+normal+distributionPDF 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_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 16864 bytes
SHA-256: 78828a093060c9f2ce834ffcd6980cc606960375a784c0dd405321dfab54b45a
font_02_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 10832 bytes
SHA-256: c5729a096abe1f856c5316e7eec9e84130f064193995e6b54349a93d5edaf8eb

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