Malicious PDF — malware analysis report

Static analysis result for SHA-256 c592e58bef2f5952…

MALICIOUS

PDF

77.1 KB Created: 2021-09-26 00:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 014723f0c951ffe7c6117c9eefc873c7 SHA-1: d270365ddb0a7316e96799b7784fb7ae68177f68 SHA-256: c592e58bef2f5952b1909d4f546aa74d4f7da0c5cc867a550fa48008c4843567
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. No scripts were extracted, but the structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://khotelmarket.com/FileData/ckfinder/files/20210909_F911CCCEC6A6FADB.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4db916e8---51680602225.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/66876050582.pdfIn PDF document text
    • http://cjatkinson.com/userimages/88024810265.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/zekipo.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/6773870032.pdfIn PDF document text
    • http://kd-council.com/upfile/files/34752427119.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/21014000484.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/nosuluwo.pdfIn PDF document text
    • https://nistd.in/userfiles/file/91091726049.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/lunawad.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/sb0pvpa95bfrmq27p3coq79ct7/jamonome.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/7848744907.pdfIn PDF document text
    • http://kd-council.com/upfile/files/xazamojunodifusukewibuz.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/af5dc8d05bdfc0ebca153b2221e6838d/74978909909.pdfIn PDF document text
    • http://lukinserv.hu/file/74678340122.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/75378971076.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/82clou7mh7qucj9v9pl18ppkmi/63969805714.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/89574779023.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/78195981051.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/degujagapasavumesujudu.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/faxepedelev.pdfIn PDF document text
    • http://paliukenas.lt/i/File/28306353516.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0115acecd---lenunuvoto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bcd756b8---sefesojosazivivupipegoja.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///59721514593.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-04/2d06d8bc765b1f831f4f0c4bf98438a8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=toll+the+hounds+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_off0000c67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67E 18744 bytes
SHA-256: 40901b9ded2d760ba5b4fae71190e401ba3c5ffbc7387d1afd3d4039c7933fc3
font_01_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 10304 bytes
SHA-256: 6ba88dec82ad3d312b4515569cacb4b3641398cbe6ebc7ad4bee0962fe7a9678
font_02_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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