Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b16b6051a3f127…

MALICIOUS

PDF

80.4 KB Created: 2021-10-16 03:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ca7edd2804c7622bb84a04cd1822c64f SHA-1: 456946c5ae1a2534b3588fcde492f27116c0228b SHA-256: e8b16b6051a3f127b765062b31f7a9515cffdb5fd9a842ad18e3cca238f9b75f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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=how+to+write+formal+informal+letter PDF link annotation
    • http://moscowprice.com/content/xuploadimages/file/xiduvilaza.pdfIn PDF document text
    • https://halkum.rs/files/73451431887.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/96734218658.pdfIn PDF document text
    • https://davnosti.ru/upload/bonamonerivix.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/63398653764.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af401892d7---werodewigedewunonavinag.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/50554310057.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ujcbda71boqukth1jgtt3crosd/59233801588.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/30569106917.pdfIn PDF document text
    • https://fishboat.hr/files/nokofibegapavezalamakunoj.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161447703f2405---29615004874.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/pozasofilimutaxafi.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/57964237269.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/mubezifafazisosejapefi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161622e49ba844---77152058029.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210918203656.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/nonirujatawokotubote.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/kagiwodaxeruweke.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/dujogezifopuduwafatapuda.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/wewozufefejijorakim.pdfIn PDF document text
    • http://specimport.by/files/files/nibezexidajabotajadi.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/dakili.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/wawajatudelomi.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/kixevaluzoxemofux.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/80689171829.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/tasigivikitozod.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/4434144531.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/923eec1187ccd6f5e0505263af27a839/53452626154.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_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 16256 bytes
SHA-256: 5e4fcb1a82fee5e0fcbe87aaba1ace9fcd44ba26a2386f5827df38e49a9d905d
font_02_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 10284 bytes
SHA-256: 3c3aaf4887d63574669bce2f8decc50dd00d3894ade69d2db5c9dbebe21ab9ef

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