Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b89cab93b86ceed…

MALICIOUS

PDF

86.0 KB Created: 2021-08-11 13:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8e991e7a3f20c6fb81b679d30195ffe SHA-1: 18851c91ef7d63ec0eb8afcf00df22f1910e6f34 SHA-256: 5b89cab93b86ceedec261c963c056b1b6fe1bc36262d0ed9e93bde95e2aa706b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://footstepfloor.com/upfiles/files/59544892682.pdf In PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d8ee8540---42931359211.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/72012508301.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089afa1470f3---67285291974.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794929b870e---wowasifivifibagogefi.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/54458331991.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dc3ab4c63e8de3ed258c56497d5223d6/50329857577.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/kasubadu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210616124323_1796664102.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e3f0bf0d5---wixomasusafelibaxodisep.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/5271471656.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/kenediwewanonepudufevuvof.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/fivosuwovuve.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/bezikaruzazagej.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/59587539093.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/jelit.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/nebezuxatajet.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/87764af0f92e033ed25e83c4ee2e35ac/luxosebe.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/xerelisure.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900addc71d4---wabofesatuxokemitidafamex.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/27951786576.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edda83ae57---momutunabuwojoluxidelu.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/tupewutaroz.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb35d86e6---solepuroj.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/zowitabemofojogisuxo.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/vosegubur.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/56bh9a1pl2qibfu05mvgklaar5/waxikitozaxidifanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bebe+credit+card+customer+service+capital+onePDF 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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 11032 bytes
SHA-256: 745e2b4a546640f2b12b8f4d01109180df4e11af5c45000245d9eade621b7865
font_01_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 17056 bytes
SHA-256: 973ac89dfb8b065bc92632478e36694fb5faf1cc7242c05c00c33dcb65617ad8
font_02_sfnt_off00012f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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