Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4cb4cf95feadf3…

MALICIOUS

PDF

71.1 KB Created: 2021-10-03 10:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c9b1048d2ba755f87068aa1162c2f56 SHA-1: 6701da34d90c08a20db7f1f6ba003b98851ca49f SHA-256: bc4cb4cf95feadf3f077fa14e65b46e4273a0da61e35ad51f6f03027d4e8ee9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=international+journal+of+computational+materials+science+and+engineering PDF link annotation
    • https://renhedc.com/uploads/files/202109181405373035.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a8497bb9fce3b293c978fb094b290fc3/rodamonogur.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/xidomerulesesexipaxafuk.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/vurav.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/jidupubufolavifoje.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/zedapeseweraxe.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/82494461410.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/fegilanosepazosexopa.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/9513ed916123286a4a1b0564a8055360/vumuradajakodugepim.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/meredagonuxaxadakulowaj.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/12220857420.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109162100059958.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diwalogemimu.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/pibepemalosilujefekalol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb74b51298---22145689859.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/zugeretijaju.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b6ea63a0---voxelapirosetomuxo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d4666639fd74a542cea8ed539c3c16e9/79870232800.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/3053511423.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/fexiwavuxojoporaxoju.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144485f1acb0---86344854307.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c91712eb1ad46d6da3cdee9174ac445f/mowetukozixusekifijo.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/tisoxuzujajuzelikaxit.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_off0000b135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB135 11144 bytes
SHA-256: 5db4c3e51c74a7484ba1d5c56a1f208df7b1405ac0201b9f8afeed9eb48aa983
font_01_sfnt_off0000caf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 16808 bytes
SHA-256: 36c20e405ed01b3005b65a9eed9f35bd276c1e682a24c8f685ae0f21765bd4ad

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