Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a25c167f0728e0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 02:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e608db4fb1532f9f501614576e39662a SHA-1: 77df739b029106a04e6d0d54e98c7478767f841a SHA-256: e4a25c167f0728e0a8370cbe47312e8d5439fa4a21a3f20f57bd7de1765de4b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings, strongly indicate malicious intent. The document likely serves as a lure to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=macro+photography+pdf+free+download PDF link annotation
    • http://lightofislamonair.org/uploads/files/subulupiwapubujun.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/edfcdba865a565929c336752b731108a/wivitikojasadapa.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///daxajiduzixitemixaz.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/topanokigufopidobuzusugu.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d5af9ebcd---30156263221.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/fowunigomasob.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/60134908447.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/kalexu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/215aa4e73f257f9d449cd6057fec1f47/suzovapuzeleluruxisag.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/36dfce6644821904c4376f591b5aca14/42352696401.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/25779714505.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/59084292109.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/fezabafovunimikudovofin.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/15318956108.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/88175949867.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/49992508650.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e273fcb3989b29ccdaff2143e8ceb187/vajaxabojeg.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161007f1215ba1---tubudemukudi.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a7ae749ddd8b4bd97a7b2e8c86d36b1/76136652512.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/25324409626.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/fiwelazunerovolowu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec1553d76---48525756600.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/10476362565.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160feab7ab5a02---jejanuzarefoxule.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_off0000c744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 17724 bytes
SHA-256: 611fd6a4e11413dd2ad191692861ce856bfb40fb4abb316e907939d09f5ffe61
font_02_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 10832 bytes
SHA-256: ffbbd3672a4b232b386fe3d32ef79c9125f1dcebd65f28bd877c9325e7c56c8e

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