Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c7a6d08a9f43fb…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 21:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c4a1ecff812d2b1cac52c3253b30a47 SHA-1: ce21a4577be368a9fbad8b0e2278c25604b5d3c4 SHA-256: d7c7a6d08a9f43fb9d80866c215795ee16a60f76868474650a6cf41cb644a014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oniceh.ru/uplcv?utm_term=cold+war+origins+pdf PDF link annotation
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/xesazarajutifonobenafaze.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/nelax.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/jibevonufafin.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/sutevokubezaxoraxi.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/kureporopi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/85632392167.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/jowope.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/9837069298.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec11749fe---tasodelumasazapaxisaji.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/povakefonekazeruwofiwafix.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d57605a13d9---bixujilokeredizanitotemow.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/wilefuzipexijawetonen.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/39576103248.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b76763d8257---79351273238.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/bikejixaxidosagoxol.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///50651518570.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2495c2bef---72965671913.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5fu9qrev0e8o1amnl5r28e9pee/10224058789.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/riwozisezopolisifeb.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/29970451776.pdfIn PDF document text
    • http://ud2-140.com/files/293320697.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/66017866082.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097858b9590d---17351426281.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/99739445233.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_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 10560 bytes
SHA-256: ab33c2b274cbf6bab23f8f8d68f918039288e81d4af96d31ac5c73bfdac22c52
font_01_sfnt_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 16836 bytes
SHA-256: 1bf087101133e6a8bbc73c3b789a9a5b98b8878df6539bf42017201b64fdf726

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