Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b52fb73ad64f613…

MALICIOUS

PDF

72.9 KB Created: 2021-09-09 16:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a58cfb494cc8a50a1f26de2734ab481f SHA-1: 446433c6634867e7a580982d9b17e1af8430e2f9 SHA-256: 8b52fb73ad64f613265483fdc8636105d6b68ef0382e7ebd6f82c1dbc46a3622
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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
  • 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://beeshark.ro/app/webroot/files/userfiles/files/37966112299.pdf In PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/9047895605.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/litevepavulo.pdfIn PDF document text
    • https://porfic.com/fotos/file/towevabosidumopafiso.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/susuduwujujomukata.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/jupapawivukozojirem.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/33620090485.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/097ec3fcc681f371f7249e8374c91ed3/33919705881.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613130bf13675---zezerorekevuzevejafobura.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/37929022634.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/47533869907.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906135357186907.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109010644139383.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/6170547740.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/zobozuxaruwogefemaw.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/41090461176.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/14526437768.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/56312878737.pdfIn PDF document text
    • https://rais.bg/uploads/file/xibodotexi.pdfIn PDF document text
    • http://calisnt.com/uploads/files/puponofasudabuwo.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/wometevi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1890fe87f438baa714e3d8b5ffe71d1e/vonimoleton.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b689a4e68---rudizakejomoz.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/kigubisigeder.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/22562124926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+rid+of+game+ads+on+androidPDF link annotation
    • 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_off0000b9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C4 17700 bytes
SHA-256: c2d3db103d0df753b9486749eb73a38f13dc973cc24a4c3e1e7c249ec8c1faa3
font_01_sfnt_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 10728 bytes
SHA-256: 0f1459729bd2721599e7ed93494d989612dcaa0b93d2d4e6c03cf80d4f464770
font_02_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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