Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0dcbdda5504fb28…

MALICIOUS

PDF

88.8 KB Created: 2021-09-15 15:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc38d068fd8a6f62ea34859b52b84f92 SHA-1: 13649c778ea88300d70512bc9a51a61f713d6cc4 SHA-256: e0dcbdda5504fb285b8ddd35376d866308ea7fcf727213a20c3eb4e9f13f3b6a
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded JavaScript and numerous external URIs, many hosted on disposable domains or compromised CMS uploads, suggest an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=backup+android+device+to+pc PDF link annotation
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6d4a68aa6c6d6d6ec4b231a1416c8abd/80453597071.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe6e9ed527---xasovugasimozaforaxoluz.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/81690978917.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/tozazovoxu.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/jataxoroxojodetijiteli.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/37896104214.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/34396968423.pdfIn PDF document text
    • http://unseretochter.ch/images/file/34124386608.pdfIn PDF document text
    • http://willbramephotography.com/lakopu.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/27622904805.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/1515450600.pdfIn PDF document text
    • http://dentali.cz/files/files/59821229979.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/nafizekakogujuf.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/mozibopimoludireve.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/13689356047.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e8c1de29---xulobunugurozotogo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7ce4edae---69878930052.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/14/18583419338.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/2553646051.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0c2fb99e0722ba9b4e250dd8031e2bb4/13436178976.pdfIn PDF document text
    • http://zzquansu.cn/d/files/logelivunomuluxawewom.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161326a8c7ddf8---xorajigi.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/tiwanujoleromororuva.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/46824174632.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/75337174588.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_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 10604 bytes
SHA-256: 3b2aa0a1b6d7496011531f16c7fd6e916394771081287559a167990a6c8e7632
font_01_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 17508 bytes
SHA-256: 579897106e450eed7a23662d348f7e3e6b30fe2ba1a9e2c45e2530fd9253016a
font_02_sfnt_off00013d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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