Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c905d843f586b1…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 09:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e73d8543d30c8c40d13d756bceeca601 SHA-1: f3df53f8b873cc8d1e080c901efc4c6de0fc3a5f SHA-256: e3c905d843f586b15c358ed861185961847bce4ef7dd19739904dea859f66531
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to a phishing campaign leveraging link farms on compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=free+cad+apps+for+android PDF link annotation
    • http://studiomarcheluzzo.it/userfiles/files/roselotaj.pdfIn PDF document text
    • https://leeleather.net/userfiles/file/73626378416.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804f13b0d0---jevepi.pdfIn PDF document text
    • http://jonme.net/ckupload/files/wezepegofev.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/limifos.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/84128485339.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/94793519346.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a59fc3b1b---77559721404.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/79704095872.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/disodopu.pdfIn PDF document text
    • https://elemonbg.com/Files/File/61209479255.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/17814994605.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/95539789195.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/25692655434.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/vamarojivo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9e34bc8d8---jisisetorib.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/movanexesonigibewixude.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d63b27e79---xetakojawusevufeb.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/90567411633.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/244804_gasuxejukusosope.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokewezuwan.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/j8h4ri7armii98354agbfrtebq/lagewadik.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/josilofuxu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/wivovarinole.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_off0000af5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5E 10448 bytes
SHA-256: 19a46981b1aa5a13a0afab5f020f6e59912512edaea020e5f1c04dfe1f65120a
font_01_sfnt_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 14676 bytes
SHA-256: e95bdb1c1fd86c6a1c55712de7bc432d9c22326be20386fab0cda615852dafb6

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