Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d989481e633b9a…

MALICIOUS

PDF

91.0 KB Created: 2021-06-29 15:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7fcc9a30f7f88701d8e5ea6c70db31e7 SHA-1: 7f4a328853687ae86c1d7da412ff289c7a753910 SHA-256: c6d989481e633b9a289e7f543511cef5e8dcb42e755486f00038549b4677eba5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and the nature of the linked URLs align with common phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a086b4598e4---3843271351.pdf In PDF document text
    • https://juvelyrikoscentras.lt/Files/file/34113147920.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/79244054853.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106261046508512.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a576b294d1f---raxezitolive.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/tobapemikif.pdfIn PDF document text
    • http://moristas.com/userfiles/files/poxer.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cffd29b3f14---698625700.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/eq7d0p3j0pjalsa1mlvcbnsuvb/vevejajibufizefomad.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/dizoxekof.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6f029cc3154f7a1b041f88d6a78717b4/45632048702.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/nipavuranuzi.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/siwadudejajawivigok.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/83001411283.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/90180429965.pdfIn PDF document text
    • https://renetravel.ro/images/files/2344184910.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/80816677935.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8fae42656---jowekurevenirudegonavex.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a6b41ef961f399505fd56af3702c511f/tajibukarepa.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/xufupijofatavizopev.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6340b2a54---19000851145.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/61746621387.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9adbcb75dc---49855694119.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/wivejisasefonebul.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07fbbf48a---3816129998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hand+signal+for+motorcycle+ridersPDF 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_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 10924 bytes
SHA-256: 02541f4615bca9cea2fea98f00c302035ecbffaed59bab4fb9c994f178ae20b2
font_02_sfnt_off000131d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D9 16632 bytes
SHA-256: b181bd4c2f8f198dccc1c415453b25a3300cbc4cc2aefa6d444bcd5c87857193