Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8f3ce050285f45…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 23:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33ca883b2b0aaf3df336bd84cf1b9c7c SHA-1: 2c666c5a8c7fc05b2abc356a5f8daf12b9778fab SHA-256: 1a8f3ce050285f45f2fad2026e48ce8a0e33a9b012953f77ea9b9b4b5c7092e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and does not provide direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=multiplayer+idle+games+android PDF link annotation
    • http://studiomarcheluzzo.it/userfiles/files/62927616847.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/58ee28b07475828578aa90b044b5ce44/sinowi.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/mosebunuvixunenefez.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/dupovabesesodawewe.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/9733181883.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614064d087356---nofexonilugafivefojeneje.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109131214055921.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/78000349226.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338d75a86ae---zililewegekidif.pdfIn PDF document text
    • http://sdes.in/uploads/wibutusagol.pdfIn PDF document text
    • https://vzglavniki.net/data/file/xubigemumovigareduraweto.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/94437947761.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161427a65038a7---tazamofedulozekabelit.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/30448177379.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130194c29cfb---18674696896.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/82670649687.pdfIn PDF document text
    • https://regenerateacademy.com/file/fegifutiwopewepenupexeg.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0fe50926---82108862869.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b8828d842a89c4bb953a7180ca7ffe09/munewogaf.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6990f759---mukitovivowowenara.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/18014986986.pdfIn PDF document text
    • http://tencanpowder.com/d/files/xasomen.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109121846446182.pdfIn PDF document text
    • https://geloracinta.com/contents/files/82053106991.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/semunezetutaketemajenif.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_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 17104 bytes
SHA-256: ee43f088f5ba29970e887eefa62fa5a1c16cd1a1f8355eaa078a43c8d2175529
font_01_sfnt_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 10944 bytes
SHA-256: f907bdadc5e7eb827e16fae299b656d8e3318a94cff9442a5cc0835ae874c82f
font_02_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1