Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4d7ae24f21ca6e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 20:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bd4f763ccbc09c339db152a6425ada4 SHA-1: 95aa4514a9d418bbb656a60c41c2cb89afa01fe4 SHA-256: 9c4d7ae24f21ca6e62c66ce8b6e6195143f0419c3b91e137cd6b87ebf052a41e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The presence of a callback lure indicates a social engineering tactic to engage the user directly, likely to extract sensitive information or credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1e4bbdcd09622e650b9dccbd8e9a8402/97052494987.pdf In PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5cb49706---tipufapej.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c66790d84ec---74544418928.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/wibabuxojixuvipemiwefavo.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/vobopojexevaboxabuwub.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a886bc5e8de---ximatosurikesanoka.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/327bf229fbd2e6186094b74c93ff2df9/94894372404.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/24678223269.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d7fb4f14bca175f6d86d3c08cca33e94/98402431083.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e68372536---5717932666.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/96604119615.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/misubeduwiwifonivu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c3e013d25---60540582291.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/69460073348.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/54606071918.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/javebafukigut.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/27698805712.pdfIn PDF document text
    • http://posuni.com/userfiles/file/zujigadalowiwirinofefefex.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/83367559751.pdfIn PDF document text
    • http://kezmosas.hu/files/file/20361615892.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/dapanidapudalopat.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bf945b7f1---25035427529.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/visedaner.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/60cd37394132b5e71d46ab8afc2ba17a/61154008937.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613103947a0d8---towexalubeweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=descriptive+english+free+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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 17792 bytes
SHA-256: 8297897907361977abf998a33b8ec6ba342f8418ee3241285e5109ef2497db0c
font_01_sfnt_off0001058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 10684 bytes
SHA-256: 1e4b93b8d962bd8ced6cea0a8c9b5ec1770d2bb9af0e9e473b230259ea0ff04f
font_02_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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