Malicious PDF — malware analysis report

Static analysis result for SHA-256 812f6e8c9dda495e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 01:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8964742e218726b330a50336f0ce7058 SHA-1: ae36467c6e7093459b163ca93f9cf36b1348128f SHA-256: 812f6e8c9dda495e01bb11442e2e3764865fb1ba25e3af89380b5abf3517e2dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, which is a common tactic for phishing or malware distribution. The PDF structure and embedded URLs suggest it is designed to lure users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/39b359db0f06144832d67c0bc6eb10ff/66200579375.pdf In PDF document text
    • http://scbczy.cn/up_files/file/20210618_135317.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f3213f89300---nugewuvokewut.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/sezoja.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/97478090615.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a0317af4d4edaa737381702337652ece/limebenufiminenogeberapag.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/bonibexawuvure.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/2536194056.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8e16e0f19532019802f0041514788ef2/gevesalim.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/duvatowomarujabobumino.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g4t9rr4sf65ttgqacjm59a4897/46617935879.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/tedakugibonizar.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfe923137c---47272014496.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b97d14687ab---wazefiragesugusu.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/81024789228.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/26805382447.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/givaxaxovupe.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/7a8c9aed9cdcdfa4d9507deb928ac40c/vatebenobovavufemeb.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b9edbf49755d9c07cdaa25133100ec46/suwalozupugos.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/jk6m00o4a2mps7ivccl4e1afb4/80732959482.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/xowifefewelugenopire.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2106140353262610703uftc4.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=characteristics+of+expository+text+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_off0000d06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06F 10812 bytes
SHA-256: 03d6b01330fe00039d12878375857507d87ae6cd4d42c0892b7e631059b22693
font_01_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 17180 bytes
SHA-256: 7fb73c8035588b207778fdb02e7f4a33b1b58521667c2d95acc5140d2ea2cc73
font_02_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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