Malicious PDF — malware analysis report

Static analysis result for SHA-256 568ce3b82ca1cc9c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 15:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ed5825f3346c5dc06b86994a9bf11835 SHA-1: 99bc9845f91840fc93d9589a228f6c51db780f2c SHA-256: 568ce3b82ca1cc9cb1cbc1bb779ee56b02fda1ccd25bf9c72d1d6224b0f17ff5
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://duvanco.be/docs/files/87923271216.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096df8fb975d---6592346538.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/paluvudakevafanebibon.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b7n62g1f2cnmusskabslbtt5g1/19277992253.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/pogijonixejolizipevuviben.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/64092391975.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/xinexudejosidibekulojidet.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/96789443187.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/119h01mgd2qr0g5nvtblcf91ri/72235297471.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wozenepaxinidix.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/807d2026683831fe4da1955f24f4fef5/leremelafidusup.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a3cfeb328c---joritipagemorezof.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ub050lbj6b5pguvmb041fhsbc2/46706209095.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/23134819239.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210812052633.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6fceb97da1853129b528797f5c53a8b5/96956876091.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/fukokozurafozeso.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c871a8a1d86---26702017047.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/9894452936.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e2cef0cfb8054227cf576ed547fdc1af/wanomimesulesegemexaxus.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6c341a2c---36892481775.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///42383250600.pdfIn PDF document text
    • http://bjallstar.com/upload/file/46417699481.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a73e9199d---42863330378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=marion+classical+electromagnetic+radiation+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_off0000d2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B8 10956 bytes
SHA-256: 21ee12e0f731ecd591703b365839f18ed8450156bb27273c34833d8e107ec798
font_01_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 17284 bytes
SHA-256: d5321e54ce3c51dece8b7f86cd1362ef1ba97918dac09d8b6b4a4b051165384e
font_02_sfnt_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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