Malicious PDF — malware analysis report

Static analysis result for SHA-256 46234ea72d6dee93…

MALICIOUS

PDF

76.7 KB Created: 2021-08-18 23:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09495fedd6355fcc5bef8106a7a5ae7e SHA-1: cf09eca092bf253b79cb974f6ef71f1d4a59c917 SHA-256: 46234ea72d6dee93fceb4ce3b5dcb1aec12c657bdceb04fd10fdc7a1e579a4d0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of exploitation attempts, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://cottonweb.net/userfiles/file/bogatulupigutilemeki.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077814997d6c---29882548435.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767cdfc9327---21361879759.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f9ea200c5---18555863773.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/363b63779a3f9cc0852dc4deafbab4b7/13202258242.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608004c321c06---97580681583.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/97992660115.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/tedafukatetin.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac16c6d499---97022489125.pdfIn PDF document text
    • http://exproofparca.com/images/media/files/36916160963.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fad50c9a9096d0cf17c8d6c233381c5d/xirepurupidi.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/26274055573.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16071bde10b046---dufef.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e00224e1---javifumijenu.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/plhti4b0p48np062gsie0po0b5/33499938623.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tajeluzukumud.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094aeb0d383f---namakavowozixuriridulimar.pdfIn PDF document text
    • https://areicon.com/images/file/24418332399.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607564072be60---59109135324.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/49532995623.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/75009080458.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/96322955400.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/waselufuwurazonor.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/nirurejorawuz.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/ruxetutudisimidivi.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/pivemogilodaten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tamil+whatsapp+status+pondatti+song+downloadPDF 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_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 15932 bytes
SHA-256: 2d02f5183b6fa6e1853456e89a38d20457995dee0445ab592c899e582823fe3e
font_01_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 10756 bytes
SHA-256: 512a5e0b31a10866f6a25926f2f7b5509d12389889745f817083149b270cfe61
font_02_sfnt_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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