Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ac6ef4397270d5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 16:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8b36691f06beb2b251ab12df3be9918 SHA-1: 229b3e5feef698e08ce73b359cb0bcb9483d4986 SHA-256: 75ac6ef4397270d5f563da4689fb955899cf15bab6db2fde05608c4b564d2d11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which are hosted on potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46758896710.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8819f2b4d---22852289916.pdfIn PDF document text
    • http://anpo.vn/upload/files/23058652902.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/92406805936.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/difux.pdfIn PDF document text
    • https://trieurodata.ro/images/file/40800540346.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/91243155783.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/beroteruvajenizokobip.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/fekikamirus.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/zoxofupel.pdfIn PDF document text
    • https://totounited.com/contents/files/pefubonan.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ltpc9jl12b50hotm8k9ps37d0g/13771508193.pdfIn PDF document text
    • http://landpas.pl/upload/file/35712135910.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/wuribelobowaguzabeto.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131277404dc9---36451612985.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc8d02210---metuwibuwotedenavulo.pdfIn PDF document text
    • http://melabo.com/upload/files/27976308367.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/67496646401.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/80146980414.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/mikebupaxadumudadetilofap.pdfIn PDF document text
    • http://bonekarusa.com/contents/files/nagagefeli.pdfIn PDF document text
    • https://ebooksweb.net/files/file/buxobozuxedizajojixusof.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/sedok.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/51879620288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=your+mail+server+certificate+is+invalid+outlook+androidPDF 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_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 18132 bytes
SHA-256: 44267cc85daa0c7d2e95349c9a10c867b77c181d754c6fcc0f595bf754e3c23f
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 10876 bytes
SHA-256: 7f13f040b7cb0a1f2beba25c46c1d320ba05ae111ffa4f3dccf004c20b9ddf40

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