Malicious PDF — malware analysis report

Static analysis result for SHA-256 5944b6f20d88de7b…

MALICIOUS

PDF

91.1 KB Created: 2021-08-01 08:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 525af6da9042ac8bfd2fd08c5c91b2bb SHA-1: ff9cb545fa84729be55b3932e662df8a9fe63846 SHA-256: 5944b6f20d88de7bc5a0af1ce170487dca1cabcd097b3ec43128e984241a58dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the link farm indicate a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://okud-istra.hr/userfiles/file/fidupumumezipakawuba.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/belokefagut.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160adea9a7ff2d---96927054798.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7bf203a4---xorudolezonal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21946d89bf---wuxubikuxaserazej.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828e8447895---tinevonulumizugitap.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/80ba0765afffc9f1a70ebbed0546dd57/42088458605.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bec6b8e182e---nifutoru.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/botesoxivevewolofiteze.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afaef84e75d---24658695480.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/vepuxixiw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e2b877422.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/gelotijuzelur.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/2292770995.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/28610687327.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/hpo5bmkrod2hqnk8blv4jjudi4/pirekotedejexitabivawom.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609731cd088f3---wakufufovosogaxugup.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/tegixurezomevogasabizip.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/fivumezex.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/97154816524.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3f2e70231ed687be9710173e98afc981/divuvibogomimaji.pdfIn PDF document text
    • https://digireg.pl/upload/66820411962.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54d18837d---xinizadurepotageso.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/jabofesurokuluxe.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/1bcvms44utd53kn3hfs54sajp5/pajuvegasegetelenam.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/xusabizatume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+write+i+am+waiting+for+your+replyPDF 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_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 22348 bytes
SHA-256: 11d6cfa5707a4ba239d6fd123708fef009ea3e5f79d8788bd43ceea89104f9b2
font_01_sfnt_off00012c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 10824 bytes
SHA-256: 8c912ab5ba471b9246af8bcb7cdc3b1cae5075204c96baf55cf43a833d929edb
font_02_sfnt_off0001457c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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