Malicious PDF — malware analysis report

Static analysis result for SHA-256 3460dddc73669e6d…

MALICIOUS

PDF

85.1 KB Created: 2021-08-30 15:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 197c4f6534586c165c46d513fa35d92e SHA-1: d25149587d416f754eb22903b70f271589d99dd2 SHA-256: 3460dddc73669e6dfa3e478163762fdde6a2a73fd98fc116a64865b9119ae1da
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and the nature of the linked domains. The document's purpose appears to be facilitating phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/34327579517.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b00ef248b1d---visizonifu.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/pizimipelidixuvigov.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab7d260444---dolagukujipizegizejo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d42799ba248---88749887223.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/14171741487.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/75c0f781c48ac349537e2139d530e800/22459253350.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/foxesun.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609271348e41c---dolutopowenawodo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba48281d03---10570425118.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/retimovinovirovomofoxubi.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281958456894.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/22680606309.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd2cd484a4---vabarawano.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/44117985361.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/vokigotozut.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/35341300356.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d3c9dbd6faa4089864b8694c2a18aa9b/toporowit.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/75068431585.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/62762085706.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8a7048a3be2ae4c07c321749436a878d/vujupuxuken.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160808c4056f9c---sugolorukageman.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/zefejikowinexageke.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161164456dda8f---larigexiwekurefimotagiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=litany+of+humility+mother+teresaPDF 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_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10648 bytes
SHA-256: 79a4c4f7730eeee62380bf3f0619df368795db82a516bb4346065ffe4d7fab74
font_01_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 19000 bytes
SHA-256: 111807ee51493da2848eb41228b5608aac8f8c54d87aa58eb41cad1a837efb55
font_02_sfnt_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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