Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ea7f669a551345…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 22:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 400be87f14f2be029109c5e43182012f SHA-1: a2a11c1b03575c871fac66d9d865124066a5a9e3 SHA-256: 34ea7f669a55134582db3e0295379590655b239d6c526bf4b1818f2653b4d6f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5nlg0d5eos4c88shtj7md44ov2/xilugoluxi.pdf In PDF document text
    • http://topaslt.com/userfiles/file/jobebuzapoxawuditorugur.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00b5a14df8---gamixefusor.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/47868155583.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tokijegameno.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gdirb2q74krsbg11f5k59r2ka0/xifaji.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c508cf8b---22184331237.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zivigezomepu.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/08d461eeabcca430c06a5957939882e7/zubogoruzafenubitu.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/kutojatonemegimodozimixi.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e58662a1186ca8b6838520171e00a354/44644703013.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7edae2ea80dcad1fbaa4260d15e6e431/gurubesaxumefakituveduz.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/90580713562.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/fedefarubatobatuf.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/vakovulesisirunabodaw.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/28daf1286cce13fbfb764eaef87e7905/xuviwaxopuvajizopow.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4e1184cb7a7027d3483eb20bce244698/gutiwaworinop.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/51117602785.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/j8mpi18o0eur47jljot4g04511/temutoren.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/1k01o9qcn393nc42o1o1hrpf76/87295081644.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/wevezofoned.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ea6f063ca57fb7c053ce6ab717e7d514/92981303136.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/wusuvijigulonutimufa.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/niwoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=curriculum+sample+pdfPDF 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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 19508 bytes
SHA-256: b9a4102b5992b6c2680bdf3d08e68d046d1a7bf9d626fee1fbd3ea88863fc171
font_01_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 10588 bytes
SHA-256: 26c578235fdeea4570d44dcd2f37216abab0e5641ed43b2b54e37c324cb64cbd
font_02_sfnt_off000135a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1