Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b22fb3ec41f6d5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 01:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 735cf13b9b7955c192917f5e5133b8ba SHA-1: 75708ca87f673fa40f2a33bbb105bb04b30c99f6 SHA-256: c9b22fb3ec41f6d53f5fa2385e6616596cbb12611a73abe3fb47273e0d0f2adf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to phishing or malware distribution pages. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://laborke.ru/uplcv?utm_term=third+grade+math+subtraction+worksheets PDF link annotation
    • https://topconta.ro/userfiles/file/kizobipobuzo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7a2f3f0af32ac79f5064e62c4b9cee49/munezolobezokobadefebon.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/18371735147.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/zijotatazilodoguf.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/tenagikopojine.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c39a75241---27053735602.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f827f2a98e---fudob.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/53877329674.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/64617347333.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcba5f9cef7---91904113613.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816dce6d0c4---pafafubanunitosoxate.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/rajonipusikudekewonofi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bee1fa7da0a---tiwibegafebojej.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/37840394022.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/39954003292.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/23947243375.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/jusitiwif.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/7327189090.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f99e7d79---32846183703.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/bejemijixotonodago.pdfIn PDF document text
    • http://abwrva.com/uploads/files/dazebofikux.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/tetabemal.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_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 11152 bytes
SHA-256: 602c9c4ad7794ac3d00857082bdbe4d0ed407a72a5e591a69469dd2b70753b35
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 16788 bytes
SHA-256: ce02ac32aeeccfa56923d7e96d1f1a8c617f2f8ed2e066908e0b9445713144f7
font_02_sfnt_off000129a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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