Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da03eb527235620…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 19:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e86007a9eef53cf886b9277815846475 SHA-1: 6e9865d5d62c14363025566216cddeb02609c3fc SHA-256: 7da03eb52723562037c0667f48404d1534b04bb360c64cc5fcceb3da7a6c4e6d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users through multiple redirects, including compromised CMS uploads and disposable hosting, likely to deliver a phishing or malware payload. No scripts were extracted, but the PDF structure and URL analysis indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9356

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 http://herningbadintra.dk/app/webroot/upload/files/tixifaje.pdf In PDF document text
    • https://aurorabersinar2.com/contents/files/vorepifudepuwag.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/petekufimefirikalufef.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/fokuf.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/15b8f58fd46c99d8ad2fd89e65efb415/49411793109.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/62731ecffbd86ddbd4ea437c0ec35558/14861083559.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/36638996858.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130bfd1b2032---98719453923.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f0edcaee---11988694079.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/79891293670.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db5993cd1e---xorozofabusonetan.pdfIn PDF document text
    • http://swift-tw.com/lcc/upload/files/tatodevabes.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/bapudikurojupobu.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/70462671368.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/nasezisefigowesoza.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/farixa.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/bebasaxosesotamufanu.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/pivatutapawewutotud.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/vebowupeferugu.pdfIn PDF document text
    • https://netpage.info/userfiles/file/20992168186.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/gimuvapagubosiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=1200+sq+ft+duplex+house+plans+3dPDF link annotation
    • 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_off0000bf64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF64 11120 bytes
SHA-256: 2e2331337f2cc1111d85d5aa7208fa331638dd3654eecfdff7039d235caf9e01
font_01_sfnt_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 18280 bytes
SHA-256: c8a4ee4a9f77172ccef6508e53cb1c6f27fb3e92c554acb2ad948637a59b0fa3

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