Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db6024136895df8…

MALICIOUS

PDF

92.5 KB Created: 2021-09-02 14:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 57195d1407ae358db3026234bf29e5f3 SHA-1: 1432cb81b6ef27fab147d9499e1e5dbc42cf453f SHA-256: 5db6024136895df849ac21b7184cded63e55189bb14aeacbd23862e1a6b269dc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on domains identified as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210803220844.pdf In PDF document text
    • http://erh-hu.com/userfiles/file/ladamaxetolodibune.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/56514325047.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/kabezin.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a211e56c8e9---18716482548.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pbmgge3bpm9i5pmesen0a2lr3n/binubokagiluruxu.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/dubotisetasamodiw.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/bapubigazajopuludu.pdfIn PDF document text
    • https://isosklo.cz./uploads/57084711077.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/givewupit.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083e19d4ead5---govepenonur.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/kadaxijiwezizifetidiwiji.pdfIn PDF document text
    • https://seger.cz/userfiles/file/29077769443.pdfIn PDF document text
    • https://saam.vn/images/content/file/pikexixi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tmcqahmqla447fa6dd4csrjn52/99528153190.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/5961405345.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e91a5d69c---6222181251.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610017a893e69---34144239150.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202108220926316930.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/53976120838.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/69157069025.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eba17518e4---90833996757.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/39837731868.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/piwedu.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/50661082322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=segmental+anatomy+of+liver+pdfPDF 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_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 10928 bytes
SHA-256: e9b688ac48d821ea2ad5186880e5d2cbf11dc6c5cbcc9906a0beb3646fe4cc21
font_01_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 16960 bytes
SHA-256: 0f8ce72b22a533d7c8ea5d8ca71dcc77a48e65887aaf77690a9aebfa306c43e0
font_02_sfnt_off00014bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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