Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be26d73cda0079b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 05:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ea62c30a667ca2cabafe2a80fedf70b SHA-1: 3bc0f4520b3de7d3ad63945d19a558ec2939af08 SHA-256: 5be26d73cda0079bda4c481b5ee4321675ae46f31be2668e4bbbe793d8971cca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, including compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://servicepapik.ro/files/94036530201.pdf In PDF document text
    • http://amsuatrust.org/survey/userfiles/files/71899027381.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/tezaxadafezebogolem.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3a2ce489f62ead59d10d0e29640cd953/78300558738.pdfIn PDF document text
    • http://rhondachem.com/d/files/zaref.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/10471194486.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7f0bb0d29bd6ee1b1db79151f40c60c5/31559774800.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/59182713727.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338ec8389c0---januvifev.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/78356157967.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe40d234bb---68854693919.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/51373333192.pdfIn PDF document text
    • http://test-immo.com/file/15194427471.pdfIn PDF document text
    • http://gdgom.com/upload/file/2109011430319773640z0cabhj8d80.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/xerunowowosasosojulorixo.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/mononenugakijuxuzogipa.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/bikizater.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090323064750.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5e207ef7---60400957718.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/linowitozegu.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/1109649573.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/69f248ec7a6105068c695881e69525ea/75842866355.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/73165748232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mx+player+full+version+apkPDF 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_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 17168 bytes
SHA-256: 74180eec1eb392ac942526b2de77e569ba5bf877c54b35592b24ff44208ab36d
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 10720 bytes
SHA-256: 9887e1e2d4348c4d9ea0d231c723c05afc64ecd2a18674d9d806d9b9c70107f7

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