Malicious PDF — malware analysis report

Static analysis result for SHA-256 767e7a986cbd1104…

MALICIOUS

PDF

85.5 KB Created: 2021-10-07 02:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b433ad8682ab6caae4793596c8ee6c9e SHA-1: 19176483d99ee79401d02a5fcc55a947589c1268 SHA-256: 767e7a986cbd1104a8c76b980bd745a5d062885d87c44c5e1fca9b920d9b70e8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of JavaScript indicates an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=coal+questions+and+answers PDF link annotation
    • https://lekkermooi.nl/userfiles/file/51419618796.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/78000628755.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/zudumokizubevozatubavore.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1653jjne1sfj7eon0nkvnt0k5l/pokilaxemesamesudipupagi.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/52470508468.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/jiponaragor.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/87936902849.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/93524543326.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20211003152245.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/91626449929.pdfIn PDF document text
    • http://adveotec.com/img/file/wugugiwo.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/xamutukagetodid.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/dc33def8b340b202f0188f02a6009766/40964244569.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/28816041561.pdfIn PDF document text
    • https://jagominum.com/contents/files/93178981889.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/45355290673.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/87655491834.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/91060975860.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/84313921502.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/xinoxezebikof.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/kimebobaju.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/20487671109.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca2688223b---vajabadomasawejor.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/ximagimoxuvolave.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/33412297524.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_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 18152 bytes
SHA-256: 2ab2c967f59b52b81f7cf449cbffffb718728fbcd3fc1539e645b04631890a9f
font_01_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 10604 bytes
SHA-256: 4de9be0664b26339a34f4286932f0fefc4a88c135ef19fa48404302fe4a2e655
font_02_sfnt_off00012fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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