Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4978b9cb37295d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 21:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: abab427d5df618e792b9a8fcc7762caa SHA-1: 19090be510c8a98f3a2b403e1a49ce1d03e64d5d SHA-256: ed4978b9cb37295dfe0c9cef89b6c841fda62427f5480ad11cd8ae8d3dfc6698
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript could be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://vzwsportenmuziek.com/content_docs/95780871988.pdf In PDF document text
    • http://el-master.ru/userfiles/file/taledarotuxanuvu.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/tenovaxadimib.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/vodidikedej.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/javokomuvab.pdfIn PDF document text
    • http://imoroz.by/upload/file/pixojoxebemagerip.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/waraxozume.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210912114740.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/42278043315.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8407eb5cc02f031251910caf1cefd8dd/97835010789.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210902115746.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/gonamewatesibafopadod.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/84804569559.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/vunikezoxajewak.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/pifelatur.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/fufawevunajilubix.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazijumipi.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/zinuxanonufitotagonazimot.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///xadupezodiletipubon.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c17fc7c9a---jopogimijazudasosomo.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/vadunaronuv.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/97593329286.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-21/20210921142103250708.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614649c9a21d2---nugesonumuxapenire.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/41027144784.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/64182116975.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/77042526196.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/pubepagosetudejegegamibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+escape+room+putlockerPDF link annotation
    • 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_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 10628 bytes
SHA-256: d4109ec98d4f207b0fb436bac6890c6d08ef9f7432dc2e793dabc45b75f0d25e
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 20672 bytes
SHA-256: 7f9e0267ef0d9109c4692c34fc1b998decb6a29a62e9a1a571e4e341d976c717
font_02_sfnt_off00012db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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