Malicious PDF — malware analysis report

Static analysis result for SHA-256 5845c087355f59ee…

MALICIOUS

PDF

72.4 KB Created: 2021-09-08 00:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8abc3385d50851d6bb643192d0c82108 SHA-1: 9afebcc066619c4d21a7eb7b3af595f6c1275000 SHA-256: 5845c087355f59eee77bde4dbbbc43a9c0e44aa0107b5925ba098bc917e214e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also contains a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=today+news+paper+amar+ujala+hp+pdf+download PDF link annotation
    • http://www.advokat.com/app/webroot/img/fck/file/nafik.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c32fe4a6f3e---80452709600.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/rimufosutuvijatusupifipo.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/83783734502.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4b5a8e3408e383de953e4965fdfc03fd/41029896522.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/fodamawabu.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/wajoledumadixari.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8aa4b1615980cbb8b94fa3218f225dc5/gikasotedubisetimegutez.pdfIn PDF document text
    • http://cmtsport.com/pliki/kibilipotilevolenazisut.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/32240680159.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/tumun.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6187174e7---mabivuwerukidetowagena.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/ruvobugob.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a056dba12139e87b086bbff38f8a568f/bezirejuzotonekunedagodim.pdfIn PDF document text
    • http://shesob.com/file/files/jafijegajurigoxivokazas.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/91617820133.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073904e41016---pejidafuxukekedozopir.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1360879c9---futuwip.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50665d6072---99868697557.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/rosipigi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fab07c6c1dcfb54c3f012b3a915c48b9/mexokarudatulakanavi.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/59968656927.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_off0000b6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BE 10964 bytes
SHA-256: ab2014c41ba005150efda4e932821a5cadc298252feb96b7698b3268900e566e
font_01_sfnt_off0000d00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 16132 bytes
SHA-256: e415efdc0aaa1d5e3aec2e8923be654043ddc8fbeee92901d883e00c5c3fa7f2
font_02_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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