Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a509fadef30134…

MALICIOUS

PDF

93.6 KB Created: 2021-08-08 12:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cf510f63154a22c54997a3940f517c1a SHA-1: 7cd4429da659bd588e838511a9f2cacff74b0564 SHA-256: 05a509fadef301346bea09d598828e1b45be32d24ffe0c06c3db78d82260f790
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits multiple indicators of malicious intent, including a high ML classification and ClamAV detection as a phishing trojan. It contains numerous links to external sites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure and instructions for handling a password-protected archive strongly indicate a phishing or malware distribution scheme, likely involving a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=coral+reef+1+gizmo+answer+key+pdf PDF link annotation
    • https://wickedcheesy.com/images/file/94314779485.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/51683529384.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/bosasakokovudejiluj.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ucotr68sn4s0euhvjak4hg0as6/73095216216.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7e08ed2401ac7e8bfd776bc36ca6d79d/7283922419.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/33231194911.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/37623955137.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/botepogawirobiguraxu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b56ae775da---15411257266.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/lonosot.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/617cd8dc1b0540b52624c9b1c55c714d/98557034168.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/79944739064.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf045c422ed---97267822405.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608589c10f523---mobipivofegadivofokujedi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8acd4d6b---82269184220.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/jaseb.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/radebupagijotipuxeni.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7fa45b402ab7b87ae76d425943b2ec64/503372243.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/434dc0a075864979fe1650eee471a2b4/86607900754.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/junovobifufofure.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f88d99e057a926194a7c91509bb85f90/58192099570.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0a08f475af940964adff7dc55677b79f/mesipiselokivikigewusesa.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8c00fa68ea1c796614789732ba5661e2/muvonidatuvagupotimij.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 16748 bytes
SHA-256: e3315a6bab5e649da51b08b864a0eb9bc7a072289558d29ef99356d9e6dff859
font_01_sfnt_off0000fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 21496 bytes
SHA-256: 526f66e7e2a3a24849e52b6c03e24453018390250c407df6267d458e922cd1a3
font_03_sfnt_off00014df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF8 11176 bytes
SHA-256: c725abefcc7274d3a62dedb8df44143bfe9b2314b52354ea7bdd6cd880a270f4

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