Malicious PDF — malware analysis report

Static analysis result for SHA-256 e664e8d6915c0b6d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 08:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: baed69b9aa312277474db95e128c7004 SHA-1: 6b297a31f1f25399db4f428381fee7ae597a500f SHA-256: e664e8d6915c0b6d42adf53edb47c815f03c18e13505fd194a62ac396582eee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://huntic.ru/uplcv?utm_term=five+phases+of+mitosis PDF link annotation
    • http://www.anclupnapoli.it/userfiles/file/nasovomison.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/25adc6e2cb6f4b99d6ed97760cf96c20/gejabozerilumexikotozapa.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0807bca5b5---rabunelerubanaragadote.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/16117463898.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f685d1badd---24445874681.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/94730811827.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd477e86e---kimofofogogigeloriwekuvaf.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/wonowawonakizagekogepav.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/sosezupuxuwonedelenudul.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/sakarotetenujekefusibu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a7c920f7f---mogipuv.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2f5bd5f37c0570fd139cdfde2a892d6d/kejabepisibafaro.pdfIn PDF document text
    • https://webmenuplus.com/images/file/gegop.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/pumabvcscjgr9kut4odf3i40ap/50564265959.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a6ca717ed---10728358200.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/kaderipoj.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/zunadikobe.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/pjd3250dmue3p2bfm7lpv794m5/nopesazatemed.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/25044292978.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b515600c436---kesugimokozodolidilepudow.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e8095f05d---jafoloverenog.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161144cb37ca8b---kimamojotamemogexowozol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86d0058565---53717318535.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/pkvid8c97vjchirh13llab6cv5/waxumobobizo.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/de8becef422d8f51cc95ab7a8d0ab8ff/42797305064.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/6396864915.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/mowedegurowi.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_off0000c6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 15864 bytes
SHA-256: 3755bc632cb8533631b064b2905a2486d053b1206529d03c13b52b05cf2d58b6
font_01_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 10416 bytes
SHA-256: 092a187a39792133fcbdaa7d110ad80ac9c46909de7dac3c9819e725e851a79e
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1