Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e3ee6db85754f7…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 12:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 84038882bd384ad49526be27bdeff3f7 SHA-1: f0687d2592cab7bb05d03b9f4e45b59ab9d14b2e SHA-256: f5e3ee6db85754f7dfd2b3e053631ae6af93a3ebb45a43a580c9c3b0b48dd4e0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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://wastran.ru/uplcv?utm_term=top+open+world+android+games PDF link annotation
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383f58d4621---miwamew.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/10423262827.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/fokopufarove.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1abe74733e79fb8205323606706f054b/xuxabowimixesodamoduwij.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45771934110.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/mokikoxavofevekuw.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fda25ca4ce8570be269535edc3c85d3/54027383732.pdfIn PDF document text
    • https://totszerdahelyikultura.hu/images/file/78819616647.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/35884832514.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355b6d69a6a---vafopilorubodozupogita.pdfIn PDF document text
    • https://coevent.ru/upload/files/gotibuwupap.pdfIn PDF document text
    • http://analhospital.net/file/files/wumetazipigifiwavuj.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/30445876628.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210910205444.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/69470212005.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/xesokale.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/86549269942.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a45118dcf---lozuzebalo.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/64286626413.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/49624019379.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/43771539215.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/65800509849.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/6742823840.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/sezolisafuvaworuxaneseli.pdfIn PDF document text
    • 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_off0000b172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB172 14852 bytes
SHA-256: a311b1efbabee4ca4d122bd6ca2707e375a7c16f2be3212f989c63205bb1345c
font_01_sfnt_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 10688 bytes
SHA-256: 8616f4cb4e857eb0a508d10f2568cc020245292fd969ef9c140c3f492e25688a

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