Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4df743cd799efbf…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 05:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e13d650107c01a090e145eed6102d21a SHA-1: 63cff5635c3b1857fc4fc48a7cefc1523f0ed538 SHA-256: f4df743cd799efbf5c0bcb8ad6b2e930efa1f6603fc2e4c6ae36771ff9f632d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, designed to direct users to potentially harmful content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vargyasnekonyveles.hu/kepek/other/file/zizidagakugodurarolof.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fa4d2472---bareranososibe.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/84508219940.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/tadojedakizi.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/befoworelufulomomifo.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/81206379570.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/2784620598.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630559244.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0d9c91b4c4cfe1aed92bb2e614aec601/58804896408.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/77019015037.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210901064159.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/niwebowuzopubeto.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/bawukoselelamunizanafem.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/11125333488.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/80302434963.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/rifedirapit.pdfIn PDF document text
    • http://snft.ro/media/file/denudugotavawurovi.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/murum.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/zevejurinu.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee3289645---litokofuzaragokopo.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/woxupojokadukupelemazo.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210910_110749.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/mudomidadasurak.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613324d46a2bd---wizozugebovugapikaf.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/wemaxizuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+adjust+clock+on+androidPDF 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_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 10628 bytes
SHA-256: 2394aba24c9b127777bcf430dce6a325b7cdc9f0c5768966ba7cc7d65cd5889a
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 17884 bytes
SHA-256: c0487b2112ae7f7cd64e4229259760c8d85574c6c06d544f893925d3b4071242

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