Malicious PDF — malware analysis report

Static analysis result for SHA-256 481ad67776589cab…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 19:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0210ed9c9f9c6de198ad8cd54a71d6ff SHA-1: 7d3bcfd120b682ecb3c8b217de8e6c5bb84aedf3 SHA-256: 481ad67776589cab940c3c0970ca067c5306ca3c5a1f654c0901817c562e418d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. These links form a link farm, suggesting an attempt to manipulate search engine results or lure users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file.

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://globomax.eu/userfiles/file/mememolami.pdf In PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/21168900801.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/boratarafesasuguli.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/3448384229.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/35928482794.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/91957166061.pdfIn PDF document text
    • http://upakuika.com/img/file/gunusulisor.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/76987486512.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138917cc6f81---jikanadupiki.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bd1vkrkor5mufu9gcrs3invpvo/88153317578.pdfIn PDF document text
    • https://megashina24.ru/files/files/zinof.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/kawekonowa.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a7c0578c---wujezetinafow.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/66205101673.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/62005171797.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/48612494218.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/13519061834.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/69375655735.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/noduzedodabavasijabida.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/tukigubofoguvazusab.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/turejukaziwifamadekug.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/sigozup.pdfIn PDF document text
    • http://hkacca.com/userfiles/14751627760.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/87958949153.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/47594844465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sleeping+beauty+short+story+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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 11208 bytes
SHA-256: 1c84a775a1733b17d3c385401bd577ba81b83fb4b8cc8eb17f2a76708070c926
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 17816 bytes
SHA-256: 27ce5a0a22d008b02edeca0d4daa51c2327de7c262bf77afd521ed8962248e9b
font_02_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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