Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b790bbeaaf6e326…

MALICIOUS

PDF

73.5 KB Created: 2021-10-11 23:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0568a5826af52def958be2e371b425e1 SHA-1: 39c40284fdef583c2f08cef9f3d93ea0acfa0531 SHA-256: 1b790bbeaaf6e326a6ce038294d8d02a887ad9b573335272e0ad5fc4b936e5f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://philabc.ru/uplcv?utm_term=c%23+anonymous+delegate PDF link annotation
    • http://nghieuphong.com/upload/files/ledegafakakekij.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/mogilidozosu.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/60300823240.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/38905452852.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/97248180023.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/21297199164.pdfIn PDF document text
    • http://newcompanyindia.com/admin/userfiles/file/31165902037.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/polomemodesamovuzonas.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/47020421282.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffcfd8ad2d---75909684062.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1616075c71ac69---4236521283.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/jaxutirogoselexu.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/47560929222.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zolizatomepo.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/vadepero.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/gutarebiguvogukawulu.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/96605445816.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a37ecda6b---natanusi.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/4708885392.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/15465227068.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ptfp8fdkir1v6sb914hslcv4n4/15327936752.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca7c311a5aefda0f107a105d2624622a/bejemedaf.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/tiwunevu.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/simonaforetufiz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615939dc41108---peladufakedubaxalipuxo.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/97069984770.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d467860ee4499ff72ac2ea7505272a10/80967012983.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/40112170613.pdfIn PDF document text
    • 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_off0000be91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE91 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 18580 bytes
SHA-256: 37597552619ed4ef4d8e3d12f065b5855ff6f8f39a1fb6feb016d77b1686ffe7
font_02_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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