Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de61dd0124e9356…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 20:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5739c8338123e46e21f52b1e4c17ff90 SHA-1: c9de3501cff98a9ffcd5c10b70a9b9e263a09b59 SHA-256: 9de61dd0124e93560cc4510cb77f7127dc6b2729ffed3865ae5585e3930e001c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=android+reset+locked+phone PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9c7257a1---kebududivut.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/dolavuxodipuzemepaxerokug.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/dekugesafekozabakaso.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/65345888417.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/25445768823.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/17616532761.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/rovifopomek.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/fodamamanimadavijij.pdfIn PDF document text
    • https://tekmaker.com/upload/files/wivaferibasomuboganurur.pdfIn PDF document text
    • https://fishuntpesca.it/file/73653421124.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/93183157653.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/bikagodorori.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/satunonekebisikenobiragu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd94a5e7e3---kewabalefukojotojelamure.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/fajikanokufedasofakipuni.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/gupaburubesag.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/xozexitomob.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/jutafakigavatenojisula.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/40933731388.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/mk1533cj3f4ojoseuhqqcldf2g/62008538250.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/bosanifezawad.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/xedikupurusujopawoporag.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/ketokek.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/pogebajonolesugubiroroxep.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_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 17620 bytes
SHA-256: 21432b6f819c4b15aaa6dea7a5062fe044740fb97d5823a9fc18855d302c430e
font_01_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 10524 bytes
SHA-256: 8e7f05203f70d05d26db8ae1771b333946b49196624868cf7ed0c72bd399aa56

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