Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4065922c607cb4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 05:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca5463d955e1d9c405abb2eea1cf1d57 SHA-1: 66d4170a8977a7a64136a067b2c8be45cea74792 SHA-256: 6c4065922c607cb495685053b17621590706c6a9dcd8603b048042ea62c47fb6
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_URGENCY_LURE' heuristic indicates the document may contain urgent language to prompt user interaction. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aclamerica.com/customers/CMS-IMAGES/file/wiwivukeropoziwelejigin.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/31067231985.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/73484240972.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097c974a9ea5---gaputanazodoxu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/o2uptub3dvbv0pili0h72ennbj/94447441047.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/17612013508.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/fozoxuzeledulenomadepe.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/6131217916.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/fopidawotuw.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/0e8a48be7283a8d573fba348a88e1548/nupala.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/27dd08ec9d12c301df3c817b5efb4693/datusedipez.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/69898338397.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/lujuwebukesewifikozariw.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/2979877622.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/luropisoluzusimifebuwom.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e8d5e24b0c4b8d7890202383f6c8f4b5/rejofawokesigadif.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/vatokuxifudakejutojem.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6149d9aa---29501178367.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/tozexogo.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/teterorodezi.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/86805962586.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210620_30494.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5e46c18376b2c1afccbae1b54f98028a/wixozazilu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/5bdfed0df61009a2c9ad33d90b1c9f9d/35236892781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=maundy+tuesday+meaningPDF 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_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 17720 bytes
SHA-256: 9e508f47b19f401c55e7e16e34214a650ea424b3f38912a9d65fe827f3f24226
font_01_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 10532 bytes
SHA-256: e25e00f6788c2f928f7a92fcb5f3ae8031be9077d4e0aa1c199e83db6bdf4589
font_02_sfnt_off000120a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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