Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9061c0a6e340a4…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 20:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24f7497eb394adc7c19fdafa5680061f SHA-1: 18b6d7856bf1bc5c35a4c78bf2d4ba7806e0aaea SHA-256: fd9061c0a6e340a4a6ddbf974a2eb0be5581ae92cbeccff9f4990a6e739214e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous URLs hosted on potentially compromised WordPress sites and disposable domains, suggesting an attempt to obscure the final destination and evade detection. The presence of embedded JavaScript and the link farm structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sity-luxe.ru/userfiles/file/92690238603.pdf In PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/fomurimowa.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/79843377386.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210917045838.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/15677476294.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/85589883505.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/54265622249.pdfIn PDF document text
    • http://anm-av.de/uploads/files/23103145319.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/viwubevopujifexorula.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/93417356969.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/49425017336.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0b0ae4bb9---11929167935.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wisetefil.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/sanepikovowuga.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6qtkpqhe6vh01djfafbi0rv5aj/ruxemak.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/wobigososamuwafaruzibud.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lp522fsj2pdtts0ob2ccuh7a53/32674321826.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414d056614---punefuwifilugifisated.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/19705197576.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/89313932426.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/91811214524.pdfIn PDF document text
    • http://dsagco.com/Upload/file/bikofadiresevefem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=apk+you+tv+player+premiumPDF 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_off0000c9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 16864 bytes
SHA-256: 2a4bdf6c66d893eebafff5120729ae9c5595e1fbcf5ce3ebadbcbfdd2989d104
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 10496 bytes
SHA-256: 929c5b7a3249bbd30e6db76c4c26aab2cac809277986fd3173a02240eec25bd4
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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