Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3623dfac44e7453…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 08:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e9fe0bd79fb842e4759a90497c34125 SHA-1: 026192fd78cf778b1a8e7f84614ddce3da530033 SHA-256: e3623dfac44e745360d647f934f68b7ec90f9e6cf55b37efcc37054c338d2550
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=nexus+5+recovery+mode+no+command PDF link annotation
    • http://www.niziointerior.pl/upload/file/57981559385.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/30135496817.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/modutetatimejiwinero.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f59e7130c9baec99d3a03f8fb09d6d8e/28633573966.pdfIn PDF document text
    • http://punaide.com/userfiles/files/83825025209.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/56943630560.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/66937719918.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/29624176135.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/89330538254.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161487b9cb388e---12426821627.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/70766364101.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/jezototudipaximirona.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/42323502327.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/36547999373.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/kowomotedokeg.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161405b20e1ec6---janivavobu.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/16826621337.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b82c7bf42---32207981806.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85741ce47---87018584722.pdfIn PDF document text
    • https://hot-pol.com/images/file/36666533138.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/49960936866.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/xifotidoxowok.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/nimizagavosi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16148b7aa2b4e9---mumemabesojepe.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_off0000b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39E 10788 bytes
SHA-256: 53efaacf8f63674ab43caeda2258393a958c62053bf52ba1a79ab1a8ced2041a
font_01_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 17620 bytes
SHA-256: 809a39601fbb5a2114dd18a08f3e51a8230d713be546bbf53aa175141e2c3fc6
font_02_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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