Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5674ef46c876b6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 02:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1b2f5e24da0384eaed422593bb35603 SHA-1: afca1e8770d3c66aeec6bdeafad9cca32161a9ee SHA-256: 9f5674ef46c876b634ffa73362c6e45a2b49f4517518f8a01226b38a8b5e54a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and a significant number of external links, many of which point to disposable hosting or compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ihanzao.com/userfiles/file/20210913202102_717763747.pdf In PDF document text
    • http://carnow.jp/js/upload/files/malelogativawepimixobikal.pdfIn PDF document text
    • http://sdes.in/uploads/20032805822.pdfIn PDF document text
    • http://newshop.jp/archive/file/xuvadiniwunomokawovakavu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946b03cd1f---gaxukikuzigoj.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/zivaribuxunogo.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/raruwu.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/577288928.pdfIn PDF document text
    • http://topflexsports.com/uploads/4593980317.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/renar.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/lonuzosodizemis.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/73734575996.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/31237396688.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/17265076506.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/5517941348.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/nodowakomamokubikikig.pdfIn PDF document text
    • http://belean.pl/userfiles/file/zujimavube.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/517bdd7b0f1abeb3de8fe009fe7b1f3f/71524368817.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/70805313466.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/39894625818.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nirepepalalaxe.pdfIn PDF document text
    • https://aromamarketing.md/img/files/kipuwa.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/88079494220.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/56729528668.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4dca866b---21288922790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=anclaje+zona+wifi+android+no+funcionaPDF 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_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 17160 bytes
SHA-256: 75fb9a68170be4fc9fc7112a67f8ab1884b73642b2f743b8761f3e480a393f82
font_01_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 10560 bytes
SHA-256: aed45c787237c1e469439ae5a140a66a32572c4b5c2c419484c1fe0636291563

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