Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd09d801c3abfa4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 19:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 66315245b91f9f76210552e0068de0ce SHA-1: dc6beb60094f2cf995f5cd7875da5c5aaf50db5d SHA-256: ccd09d801c3abfa423995b09e8fa885f007c247d4434f34ef626ce8bb3fd5166
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as a phishing trojan, and ML classification strongly supports its malicious nature. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=defi+pet+how+to+earn+money PDF link annotation
    • http://vina2002.com/uploads/files/sodutomusasob.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/47228219617.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/lotas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e16942ef7---32190173960.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/5662451840.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/42916162527.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/60027041399.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/34906995670.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/sagefisunozakupogupaw.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/gidege.pdfIn PDF document text
    • http://machulski.com/public/file/61292013444.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/fomitir.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132abed10fb7---56106586836.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/14577259659.pdfIn PDF document text
    • https://kapefashion.com/files/files/nusoxitagavonemenozom.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/95684741931.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/99390205949.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/gosakopetatixawesil.pdfIn PDF document text
    • http://unsersohn.ch/images/file/kexemeginimugonoxurid.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613444cd9dc07---12320107671.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/tebejoxegumobekuvosegaz.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/forob.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/98194357158.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/80509529933.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/bututujuxakunafupojalaku.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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 10612 bytes
SHA-256: e2ef916fd48e31f38deb3bbaf52390794eaf1b06a02e0735f8129f1430c6d7db
font_01_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 17716 bytes
SHA-256: ee07e76f4ef91ec6a2487ae8df17f7d6d929fb56cc706aec4a723058390e4033
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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