Malicious PDF — malware analysis report

Static analysis result for SHA-256 190d32cded97ded3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 13:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6180deb512ae63bba62506984436fdfa SHA-1: 4d27907cf5d3fa501dde677c5e1b604ea5789c19 SHA-256: 190d32cded97ded30cb009c71cf97daf60f48c471a088c3ee5a94f91783ba694
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrustworthy hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=how+to+transfer+pics+from+phone+to+phone PDF link annotation
    • http://centrons.com/uploaded/file/121126131361470c5ac84d3.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/bojibemazon.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/tekofem.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/36686699775.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/7527317202.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/66934827862.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-6/20210906012141151997.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613753576e795---rikizekaxinenamosenewutoj.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/97061490294.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eaa4a5676---jusozevurumaseb.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/givapowisef.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142588f4b29b---41364638439.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/58165406280.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613f80c017b37---kijanumudunu.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/negukazugulapukixamo.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/tupififalifoluludadexiz.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/vidinidewatemejibu.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/76413922720.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d085feadb086d53e7783c95cf2b3c945/nusexurarimuxarekep.pdfIn PDF document text
    • https://argumentua.com/i/file/kurat.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/99511888726.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/mojorow.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909085646251744gjbnd.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/rajokujerimekolunudikaxuz.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/1252289616.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/27643812626.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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 10776 bytes
SHA-256: 8a709a35c26e90ebb8d568066c9991122961408ec66ea9b9fed0cf7a1b20cf13
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 17108 bytes
SHA-256: 38b3ee3f85660006f5578d7fccf5f2dc03f5c5d6f5dadd1ad5e7245572a7e460
font_02_sfnt_off00012416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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