Malicious PDF — malware analysis report

Static analysis result for SHA-256 4041f40ff16985ff…

MALICIOUS

PDF

95.9 KB Created: 2021-09-06 03:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7900996debefa9a40a4c6625d60fdf2c SHA-1: edfb824610f4d8a5dd699b0ffc541c957927e14c SHA-256: 4041f40ff16985ff924543e316a564d7359b3605305f172c8e3658e108f96bbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://krisoc.ru/uplcv?utm_term=uncial+calligraphy+worksheets PDF link annotation
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9ac53bce---keviwurutekupedaximat.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/fosajejegeguso.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/56286ed091796cc776aef79abdeaa9f0/xuzaloramafowefibob.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cdd07ebda---vabamosovepiwol.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129fc29b8376---14523428931.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/nenisiwufirax.pdfIn PDF document text
    • https://ivanamihic.com//files/12952027292.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae5df2857---30035424563.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1533e8099c---17945994194.pdfIn PDF document text
    • http://ezibra.pl/upload//file/zekosawagapu.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095a8b8aa99b---kifuwan.pdfIn PDF document text
    • http://sun-eko.eu/files/file/kiviloz.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/52931973605.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/jidib.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612011e4c47dc---20934826415.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/7733876415.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/jipuragonipepidekalekiw.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/nujufowapux.pdfIn PDF document text
    • https://tavio.ru/files/file/pidatetijuzim.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/305cbf8de71be1e1e5109c0a7c35d2b1/74563114900.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/keseranarafokovugi.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/xowezewujipo.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/sawidotupuzoj.pdfIn PDF document text
    • http://beiks.info/public/file/26551132726.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/1t0njcc5fri586p5be8v66gvu4/muxiwolebebowowodok.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/sunavoguzi.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_off00010db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 10952 bytes
SHA-256: 7a93038f72888253e9b1ae22ba5e3ae8ee874c22092cb91a363a6a2ce3d6bd86
font_01_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 19496 bytes
SHA-256: f1456f770472609de5edd827c8b3bff32683369b353256809ead4e77e0889d06
font_02_sfnt_off000159a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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