Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea80e2c0957187e3…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 06:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7765d67de9c0651781912b0020a35a5f SHA-1: 1799be40889cb5690e2ffc196fc23ca80cd38beb SHA-256: ea80e2c0957187e33fad3a222f52d3092b63e99752f47660d06d224c2098e6a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ubest.ru/images/file/80824371363.pdf In PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210918145503.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/3410466287.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/xadudi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c209b4d1---55630763320.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rab41k7u9o8htqsjgg9jkcqp46/44413823913.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/62237404318.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdd468b1f2---mibozupubevepasakubu.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/82885603085.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/79965250952.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/87499963499.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210924_8B2A27F185177C47.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/zowafilekimekapik.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e43d5b6f32---96369572080.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/21723962224.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/zupizivugorafizaninizo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/alcs6cpr5vdlvk9r6nk7qfto4b/36849280778.pdfIn PDF document text
    • https://tivicom.vn/upload/files/37567031675.pdfIn PDF document text
    • http://orthopediedelft.eu/files/31678138909.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/22388298172.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/78971887732.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/zuseranudija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+to+do+if+you+forgot+your+administrator+password+for+macPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/79009520296.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_off0000b147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 11184 bytes
SHA-256: 4c8ce6d5f709c0bf7f6876b2fde9c82690be3d19a05e7a2ef0c865105b601577
font_01_sfnt_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 17088 bytes
SHA-256: 328446b222b202e9b790ba62ec9a3ddb946784ed3013ce78216cfb01a8851fb7

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