Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63ffae58155ee3a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 11:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 552331ebd8b5a20219119301816fa88f SHA-1: d26d9b69a9f78d24195485aa4372915590b026d3 SHA-256: e63ffae58155ee3af490bb7e7551e1011f09d449ab6ebf42e54ae64f42deeec7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a network of links for potentially deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://arcdesantmarti.com/biocop/Images/images-editor/file/65778659441.pdf In PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f2b97b5c---gomezaxof.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/dilivopapujabukive.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/022343549933.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/13305935753.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a029856cfda---wizizefuf.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9194a1d1c1---japupi.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/51356393810.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/67794317999.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608790f370d43---55719425701.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2sd2ugqi17kldt03sv4h9vqne6/1161789122.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/jajefu.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/14174540864.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/11710779733.pdfIn PDF document text
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/tijer.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/gozutozimipuvajewobele.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/xemat.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1ae989693---bujuwufija.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/285f6873d6a2fd868a01c6091d5219ab/ririvuroduvifizo.pdfIn PDF document text
    • http://agrion.org/upload/fichier/86748275737.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/fijawagiwebadobapusi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tizazam.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/159b7a58d2c40a121479ee4625af1469/tolus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=9+month+baby+food+chart+in+tamil+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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 10912 bytes
SHA-256: 9dc475aec45deda6f3981ebb7b1ec4b2dbe79dbbc5b99863f54aa80d6e4437c4
font_01_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 20292 bytes
SHA-256: fa0ca1ff767f9cb589cca0bca613608cc089db7b4bf345453f790dc8a9e11251

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