Malicious PDF — malware analysis report

Static analysis result for SHA-256 b950ef5b4eec395c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 21:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a95e74a60bc4904650408c56cdb682e1 SHA-1: 3116fafdb04d34f858d299565a673bf6654c4fd2 SHA-256: b950ef5b4eec395c7ff0977359f1fa23709b9b8a6a86e61dda99b808d8ae0faf
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

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 https://ascinfratech.com/clientprojects/trading/file/40494139578.pdf In PDF document text
    • https://gelblighting.com/userfiles/files/51216095183.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/18779252263.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/qqcoaogrp4ii0ohr5kfob8lih3/40706278982.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/72947225548.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/66691926187.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/981e0584907c751b91997b3bb8ac7c2e/5688351245.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477bb5bdff---nezorexogigiledorus.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/vejekelifiga.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p6o7anq4h2qp4uiij3l00oeaqh/66789129344.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pmn400eu2da9ilsch3mh7l9ib1/paxexanoxazuvefos.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/wozugugaravenez.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/54374020212.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde619e1df1---14547046512.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/xozidefuvokeremuralovok.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/21362058258.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/84328294790.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/37268736282.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/60087301073.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/77801388847.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/wiwebitosufotitazuzug.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160db2e40d2ca5---zonakejuwotere.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/dufozilir.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/adf379d003983f981f0434a19f9b96c9/zevanizekoloxuzed.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b55639b5ab5---jonaralegumosigeruneki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=enatel+sm+32+user+manualPDF 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_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 10432 bytes
SHA-256: 6586ca84891452704967b1bc9e350ce06d41c1c71772f8db7ce4853b2288da7f
font_01_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 17888 bytes
SHA-256: 7fd244bdfb57ec71c76f1c880977a1ef4e923765611ea77ce3c2086348c5a212
font_02_sfnt_off000130dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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