Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc734b8909f181c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-22 16:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f66dde1751659085fa2cd189e0dfc9e1 SHA-1: 226003331271284156229533e1cda2a79b60ad77 SHA-256: bdc734b8909f181c09a7bac3c3a6ba5cf0cb7b599e4cbbb77c1b3005264eab37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download pages. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vicc.huh.hu/UserFiles/File/sidoxonegedesizekap.pdf In PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/dimuxaza.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/vofasuzu.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/80187844663.pdfIn PDF document text
    • https://ratosatu.com/contents/files/87390689879.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/64310586950.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/91318641394.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/41e18a521964a8c69810d191c5ec8262/87405958482.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/5786270450.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/puzalojiga.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/nukojunirabitefug.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/86282575779.pdfIn PDF document text
    • https://kapefashion.com/files/files/83737045694.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/60946007446.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/84237107832.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/tuxotilitafapekipemiku.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/jitaworutopeverupel.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614952610cfd2---rozejokew.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/60803982821.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/nojotimonexez.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/7597957867.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/48266855273.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131940053cdf---fefewemabuwuvumafofuragi.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/fevukututulefamewudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+vola+sportsPDF 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_off0000b3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F7 15184 bytes
SHA-256: 68278567a4d6c00426ea2e8ffa2dc43edbf9e1bc747bd8e07f2d08256ac9f553
font_01_sfnt_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 10316 bytes
SHA-256: 113a7d6c9841124163d2c2efe2b4af66c66b525176f685fa6e90361d2511cd7d
font_02_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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