Malicious PDF — malware analysis report

Static analysis result for SHA-256 c622b4a36dd48c90…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 00:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 789d6e55cbe0370a328118ba7f8bf657 SHA-1: 4a4c88431605d4c3d49a8e224dd1b58aa9a6ff13 SHA-256: c622b4a36dd48c9007c72d2b10c32f7a0d99da3ea6bc200534cc7c7137f77744
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to lure users into clicking malicious links, potentially leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://thedreams.cz/files/pukilazopugaboxipef.pdf In PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4d836faa7426624d4690993c999bc736/97780594868.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tmdvb40de1696msmh19kmsv5j5/16638819733.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/rexolevilitav.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a25720a65---56877625894.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/gazenironoxaxupofolibep.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/eb40f7f6393ea41d215bfa8525b0d294/pipaluwizokefajepegepoki.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/fexefigebotilebosofojezom.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e973fa06d9f---gidatizabobutomoze.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4a19d29f9---17903124609.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/2245025761.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081109ee09c3---604709129.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/tivemupizalivedemawed.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609207fc8f7ec---wosoxev.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/xixawobovunenese.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/97213447083.pdfIn PDF document text
    • http://medica-brno.com/files/7140265968.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108291155399782.pdfIn PDF document text
    • http://cpils.com/userfiles/file/wuvedi.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/2803076392.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb537751c---xurapavamezagimewufigosuv.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021082318305073499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=calendario+escolar+2020+madrid+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_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 10956 bytes
SHA-256: c3fdf224acaa1e0c24b530993665571a9b9091e5e283c2769c088e82f01e17d7
font_02_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 19096 bytes
SHA-256: 5ba6a04e7984834aadf324483e2f3a4e52e2fb33e11c4f99063574818c9d9605

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