Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f22fedb2e847a9b…

MALICIOUS

PDF

71.5 KB Created: 2021-09-05 11:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 512c86e778966ac6f1c4f88761c409dd SHA-1: ffda656f3ab8fa5526ae288f10049b9a8a2195b1 SHA-256: 9f22fedb2e847a9b6b7da1920c308825a7a7ff0b4d340efa2d98411ffcc1cf4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/rl2259f808bskrpqgrm757gqdq/semusitelabeziwigepot.pdf In PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/2285155684.pdfIn PDF document text
    • https://aromamarketing.md/img/files/fazariwirapozenisarira.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021082813071085.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/rimexinasisaxafukiranog.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7c08c6c244706517fc4ff3c988a6955f/70058352053.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7397104e196a05c6d9c7027d86825355/wevobigarunuxigurus.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/24945365321.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/85446458571.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/majumixakosufe.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/60489971081.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d935f00736---19903509878.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f33e41fc28---kovewazer.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/s4j3ms1l5431lls22hj3t7s050/pefesuxikuw.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/wosekatanab.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/denafigafigupakukegowi.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeccc3020f---pojebabodun.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/tuvadeje.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f501a8c200---85379174162.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e339d4d1c98ce6870d10edf9da08d70f/mikakopomazadusidilanuku.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210509015808.pdfIn PDF document text
    • https://micsys.in/userfiles/file/95529367045.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/41a5dcd1d3ab5db9cac873f4be41de53/zixeditodilugapo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/tosefudes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=odisha+outline+map+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_off0000b81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81F 10788 bytes
SHA-256: 0d404d69dfbbb59602275cecfc0b47bb91ce16283085ddc5cd05b2ae68678e63
font_01_sfnt_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 15544 bytes
SHA-256: f66f2a1346021c0a24d43b6b0a8d722e96ba96d1f3c338167a713d62ccd564e8
font_02_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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