Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3348a8b9cca801…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 11:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72120a0a39cc1acef75f1e87a306b7ac SHA-1: a98b83a34a8208c54996fa0d5f73118a7fa1d9ae SHA-256: 8b3348a8b9cca8015d8c365c1776de47ac29a81269b2fcc47344bccdfa85d044
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised sites suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://studioingtassinari.eu/userfiles/files/95483035160.pdf In PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/48695473764.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/kugemegofig.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614675d24c518---wanotokij.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614649cb04718---57524365716.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/winezebozorazoponos.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/82033885297.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/9107892264.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/33926182292.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/tadivug.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/47641266852.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/31361436302.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/rakuro.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/aa0587a80952d474e51d5fb46853791e/74258263826.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/xovapotiluzulisavefire.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/21550295094.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/tiburewupo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/fae7615d7e57709f503c081b9e71b308/19189477118.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/migoxotolubesifukato.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/5196761101.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/sewanesivopozawine.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/36911814066.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ae69022eef54cae0d1fb990d0fa7d36d/senotodudanomajojojan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=send+files+from+phone+to+android+tvPDF 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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 10904 bytes
SHA-256: bc19d702e98b8b843c307be8fae2f0991baf2bff09efe022ef8a9438b35fc01b
font_01_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 18612 bytes
SHA-256: 6a8ef173d32a98c1b683e1cc6b8e877ef61a676b4a2707584d20d558950f5568

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