Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b035049fc2e4ff…

MALICIOUS

PDF

91.1 KB Created: 2021-07-22 11:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06bc0f74a0bf105575720f3dc5c48d82 SHA-1: 24f674adab5b0e5e6f6e9e6cd0a2866bfdf885ed SHA-256: d6b035049fc2e4ffc254c7280c9a6913db90a8be80535e148e91d234b61dfefb
204 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct the user to disable security software, a common tactic in malicious documents. ClamAV detection further confirms its malicious nature, flagging it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to lure users into downloading a second-stage payload, likely by exploiting the user's trust and potentially bypassing security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3do5ouqv78c2f0acjs8slm0ka5/kesixevexuwenerufupufu.pdf In PDF document text
    • http://www.bash.cl/media/file/6983039306.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b5d991679---wodusabukiraxule.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/rekibadoxa.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/xejojolimeku.pdfIn PDF document text
    • https://eslms.com/userfiles/file/sakemizagubesuzarowukebar.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97991a985---megagumonujaxogeje.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160838cb852890---zitenumenozuseserod.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/kigaxote.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///2741431008.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/zonirakeruze.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/fudamejutogesonivaxu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/30bs91tvkd8tukq2l9l1jh90dk/livifuzuzu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/f2lqkcesr576n23uqj0odudcn3/77258853447.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/87549824171.pdfIn PDF document text
    • https://schmitz.cz/res/file/xamekotev.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ba754be2997---30457465200.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/gutiwag.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a95395772f5---minusax.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/59932014692.pdfIn PDF document text
    • http://planbmedia.hufiles/87956579091.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/93919004307.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/vififefedusuponinexe.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d7f33f224cfc895a960e2c41b9704ee6/62662755967.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/buwedazevafe.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088eaf03aadc---6619632643.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/81196691644.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ef7143d62efbb8f4bd115f2c2cd7b848/18342853754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+call+of+duty+3+pc+torrentPDF 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_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 17940 bytes
SHA-256: f0606d599ff4b86da4534c65c0f0e882e836a2efd0d23556c66f3f69d4fa97f8
font_01_sfnt_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EC 10828 bytes
SHA-256: d2a7743b558995b373eba801d537dff12ddf63d011d391cc9b6c6ac80e2117a7

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