Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be324eeb500f93d…

MALICIOUS

PDF

82.0 KB Created: 2021-07-04 04:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f6fe76e352ff26628a2f3bf6c2f3982 SHA-1: 532563ca907914f48ce2517791dc3cd66c66dcd8 SHA-256: 5be324eeb500f93d6a4ffea40c8f18ac98c93472d32409cfb09f185e4a4b5ab1
156 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=holt+science+spectrum+physical+science+math+skills+answers PDF link annotation
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f0d92da09f617563600593a69f4b141b/kunozirewimimovalatigone.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/79622457401.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/61378544494.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daec474c12---jixaxalamobap.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/wupupikupabajoxaduj.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/57397634686.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/xojajutup.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/6696250988.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/3qampfgrgsoo6ndmp99ju0kl9g/kagifem.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e81d2556dfeca1c7e698233f1f10b6df/sidunugaxulotomu.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/buwujabusil.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/43311056556.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/77273592931.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/50136661858.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160727c5cef848---3562044667.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7anjhi2c1kl8jtf9si55qhnne7/zefaradodab.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/f0baca14f695fec47a6a748e3a7711c1/64657230546.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854bad31b11---zarawunudezizenupu.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/73435056230.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/52523022317.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/terixotegalulujifilusa.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a710fde4327---12749572375.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/523d68b21966bed97c30dfc84c1998eb/sujanovim.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/929krfsh7i7334m2q26cn19df8/42010316845.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094e7fdd1386---morirositirixurevoma.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/56168493665.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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 17612 bytes
SHA-256: 505006178c85d05aabd43a808c5a64b55f1d44032f186b1056afa82f4b458a16
font_01_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 11024 bytes
SHA-256: 7ee5597d451eb775a54a694cfdb3220cac27510d098cc929ee4a204f04adb25a

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