Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed13c75ceb24a283…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 13:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3242906fb7374f7ebf6a4783d06cdddd SHA-1: 9396b18dab44f31097c09b28756b80dd5d08726a SHA-256: ed13c75ceb24a283461e020bc59e8979359a4c920e7456e763d50452ea8c0574
216 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan attempt. The critical 'SE_SECRET_RECOVERY_LURE' heuristic indicates the document's content is designed to solicit sensitive recovery secrets or private keys from the user. Numerous embedded URLs point to potentially compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075450e66d---bumef.pdf In PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/8993963965.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/82907030801.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/mesorubelalol.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/fewikonedolutidutedipotuv.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/wiwadewovajekeverasizuv.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fbeae59f---resuxuf.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/20791027456.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/428906780d40bf2187ee00090e02fb6a/gizujowuvo.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/xadudijilizokevufitup.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/1073380506.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/23347164537.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/zonibaf.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/butor.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/lugajutusomorani.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/wibexigu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca17e344b---deramipudulenowopimazesu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4e903860656df7ff90c8ec853260653a/43102946478.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/af1655daecf5ce6d46ad327856c72776/makusiduf.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786a9b7178e---86633427.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16118e4e4d1c2d---vipukowe.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95b0089a8---19854903361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=blockchain+accounting+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_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 10744 bytes
SHA-256: 8a363d28dd727598a38853d8a1a301b8d8cee7843cc94840dacc5540ad99e2a7
font_02_sfnt_off00011db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 19072 bytes
SHA-256: 1afc91ec13bb21cff08e080840f0af5cda431062c66eded651a36b000ac38ca6

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