Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ca7acff092c1af…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 16:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37d03966a4c3c9fe0c9847a1e90cef19 SHA-1: c8bc9c5425647fcc8b48c434696b290fa43ec848 SHA-256: 21ca7acff092c1afbaad93313b7c8c8b75731b4c56f6fa71ca6c2125e0cd48a1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7745

Heuristics 5

  • 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
  • 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://plasy.com/uploads/file/64907428221.pdf In PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef72f2e680---82362644409.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/nadamases.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16138324c90c0a---medipiv.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kuvuja.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/23460906868.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/vetadopimogidanezubejuja.pdfIn PDF document text
    • http://elitk.ru/_files/90954737665.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/sekemikafinumoxunopi.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/wazewobavumopotaf.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/59576844698.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/wozimuradavak.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320e67cd9a7---28453120560.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/61616139539.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de083d020e---zarijubuvalosafesujixupuf.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/nafokovagexigilun.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/72752048277.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/punelebalopesilebakukowe.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/41260602176.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/86201666584.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/gimuni.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/zigobowakakakax.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/tutid.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/50975587113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=balamangalam+pdf+free+downloadPDF link annotation
    • 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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 17244 bytes
SHA-256: eaa3ec1895d74dab3cb2705f60f6401cdb88225ac241ca84dfec5e9202f91ceb
font_02_sfnt_off00011640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 10620 bytes
SHA-256: 4230039efbaafb09cd0c9076c45e74c1c3af9724671abedd751e70009e439893