Malicious PDF — malware analysis report

Static analysis result for SHA-256 05da3f88d6f6e137…

MALICIOUS

PDF

68.8 KB Created: 2021-09-05 08:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1e1118d612a30864a5481a3c7e17137 SHA-1: 7fa2f92bf3fe33a4353d21be31e8f9a92cef5886 SHA-256: 05da3f88d6f6e137367921e758bf19f72b204da1b064b1fff0903200c698b0a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous disposable domains, many hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The primary goal appears to be redirecting users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=prelude+in+d+minor+bwv+999+pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b62e70bca---katutunokadukuzil.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/nepemavezalited.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28fe6928c085ab3c36a5b691ce530230/tanaginekinofo.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/4sl3nphef0rv55tginepj88fs6/89115937782.pdf
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/redetubazizipepi.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a08a9e89---8783645782.pdf
    • http://bumsnab.ru/uploads/files/zoxeposijoduru.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d11f1c1bf---98858698347.pdf
    • https://mediaget.ru/userfiles/files/63496298739.pdf
    • http://yuhenganquan.com/userfiles/file/20210616031342_2105061016.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765927a7ff6---56694983890.pdf
    • http://www.annaleehuber.com/content_files/file/wumawatasadusugirowazosid.pdf
    • http://alpha-cp.com/userfiles/file/wusebun.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/jukoxokox.pdf
    • http://geasit.it/userfiles/files/85227147025.pdf
    • http://eiak.org/upload/editor/files/59088227195.pdf
    • https://kocarbonag.com/luutru/files/wufokezadexixekoxokol.pdf
    • http://studioghittigargnano.com/userfiles/files/75503528074.pdf
    • http://wildzipper.com/clients/wildzipper/userfiles/file/sogetuderedojep.pdf
    • http://wolfroccatiassociati.it/userfiles/files/xolaron.pdf
    • http://anandtouristcorporation.com/uploads/navub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af9e.bin
5b0577a955fe38a1882dcadbc8870ffa1c4af28b32145f9a24595e52405ac6fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9E 10792 bytes
font_01_sfnt_off0000c835.bin
77a13e80929c686b028ac6dd795be373a67751054db8c1df52086204c7dee51a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 14960 bytes
font_02_sfnt_off0000edce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 16792 bytes

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