Malicious PDF — malware analysis report

Static analysis result for SHA-256 1638211d5b2fe625…

MALICIOUS

PDF

83.9 KB Created: 2021-06-26 02:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e7e30fd3027d666db9c788e30d0c5ea SHA-1: 81cae11eb527fbf7888f181cdc4ed399daa2cd58 SHA-256: 1638211d5b2fe6259b95ca3134a56162b03c858b6a0fafde36ea75265081f850
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and a link farm structure indicates a likely attempt to redirect users to malicious sites.

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://medvor.ru/uplcv?utm_term=biosciences+and+biotechnology PDF link annotation
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/7ad9a9db62feb029b40aaeb5b16fe984/padikosokes.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jukozosowoxizari.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/36792067595.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb85355306---9794121355.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///pugad.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/43096868341.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/42629792650.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/9684962521.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/224a3d0b2f9f66e26d19999151018cda/95707187302.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/tafox.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/n35ggfkno41hc4ng0163gpattk/73366915860.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd23f67284---54225928716.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/18448287607.pdfIn PDF document text
    • https://giustofiori.it/file/52344533810.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210614150306.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/doxaragokumedet.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2e376578a95d00838eb56c9ba3ac7264/53733057227.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6d8117b7---23138428562.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/nezeledakejadaf.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/rurudevusebimunavoraka.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0181e45920808463d633452d29253b2d/bexofaj.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086882483faa---robowet.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/a3abefac351a5bba2d2196e94dfae1e6/zovupeleguvebibifofelew.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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 10856 bytes
SHA-256: a78366eb54b1c03379a9617cff36ee13c11feff9faf6672269525edb42df00b1
font_01_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 17060 bytes
SHA-256: be08fb88752c7fb0ee08fbca8385c062f58217448883037df655576c8dec4d52
font_02_sfnt_off00012a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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