Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc732439f2c651bf…

MALICIOUS

PDF

86.0 KB Created: 2021-07-24 06:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 199930fe1b839bfb3adea06d9cf2baa7 SHA-1: 9d54ca4215a9dbe3577253dc865731cc50aa7e3a SHA-256: bc732439f2c651bff61c53a8a70ce8275135ec6d4bebb8178579aaa30a36129f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b80b1c06---josutowinobipagemi.pdf In PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/d3d7fff9d79135cfe96712fb198a226d/katewikef.pdfIn PDF document text
    • http://dzbnf.com/upload/file///49631286813.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160802895bbb94---xurunazovadapijowu.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/21575182546.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ed775dea03ca88e686553e576c46e8f1/39331207807.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daaf5d3ea05---37224654194.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/15509837506.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61ac80b81c---zoxugon.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/wobikakotigo.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/df908b6597cbe39565b851fa13464ae7/dukoselodonut.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/67022419822.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/lekumofojox.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/notulok.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8i0iutkhsaceqt8nbgo7269eej/felizezasonegobepoku.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/41590194050.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085182e5218f---56681417217.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wulakutarunuvarozerokonab.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4edou4jakkcdmu7m8hmr7cjr74/bovenonix.pdfIn PDF document text
    • http://zzquansu.cn/d/files/65785470658.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9700a97a2---7611557483.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/72a9819cd2d5b958dd81c506bb627506/8518682542.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/jexakenunalosixoxevorebir.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/38807151139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+drain+water+from+a+samsung+washerPDF 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_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 10932 bytes
SHA-256: 96a79838ae8ad26c748fe0a947f31397081b04805a7783b392ed4b2404eca2f5
font_01_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 16268 bytes
SHA-256: 07e5ca5dcf032da5b6dadbbb1943df1422bc1ea337703fe80ee90d6e745cb0ec
font_02_sfnt_off0001320c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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