Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecf44b1d27de429…

MALICIOUS

PDF

83.8 KB Created: 2021-08-15 12:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe45c9f310406db16d00d2a7a7281d2f SHA-1: 981bba04c7c3ec477ce6953463503b2e748bee8f SHA-256: 6ecf44b1d27de4291bafd3fb36794b880d0e3bbf9ed6772b263f2b160eabecbc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document's structure and embedded URLs suggest it is part of a link farm designed to host malicious PDFs, likely leading to a callback phishing or tech-support scam. The presence of a 'SE_CALLBACK_LURE' heuristic further supports this, indicating the document prompts users to call a phone number in a context of urgency or dispute.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mayinmaunhat.com/upload/files/63263299519.pdf In PDF document text
    • https://bravo-hk.com/userfiles/file/xewubupoka.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/498978ec729eef8e733a09927f08cdde/jefifetotidim.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5584fe2bfa---zofivozikoramowusofi.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608299fce1312---wigaxekifi.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/vokatozuben.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/af3d6e91876288ad276e1add61dcf57e/gekowuborikuk.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/kimudowapawokorak.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a988d472002---38744877243.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/931ccdf21009b12747a4d5e21ad65de1/vijozuziwisezowukigon.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qm2pu8uqivm777h8d5etbpddmk/lonobeb.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/31189270296.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/pavuzaporikegojoki.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/27389795723.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092ddb0da18d---fomunulagitapi.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fuwewili.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/47354176673.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092602ad2049---66941537064.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/52212116348.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38d3e357da---50534059064.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/73824828885.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/jasonavufixufutisakeru.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/v5eelpil1bv1u4f8fu7j405muv/nazatujube.pdfIn PDF document text
    • http://philboyd.com/tevonosolerafawiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+reset+dish+remotePDF 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_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 10276 bytes
SHA-256: 5a1907240342a6166ee395bc3fd38fdbc438cdb962410ed4d81267e2b8ca2076
font_02_sfnt_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 17784 bytes
SHA-256: 27d6ab10ba1626e66ca474a5fd0aca2bd3d6a13d96bdf4aa467a479b824a720e

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