Malicious PDF — malware analysis report

Static analysis result for SHA-256 e673d04744fb29ee…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 20:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8ac6ef5fb5b24f7bd17dd2d565a1239 SHA-1: 98b3764e009bd1298813d577cc34abd18d6af1c1 SHA-256: e673d04744fb29ee9c8a048fce7aaf8c8270544c6ed95eec895d8ac9aa9d2e3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to manipulate search engine results or distribute malicious content. The document body was unreadable, but the presence of numerous external links and the compromised CMS upload heuristic strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7f04ff7e---73831752758.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f9939df4592282beaddbaf11b14765d8/2028284269.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/josazujodow.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/voxinakoludugexufuxuke.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/ligew.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/70985869791.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87f0a3477---51488919054.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/fudefamevadipaniwefafufa.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607eecb4a163a---lamezijotenurewiriden.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/tajago.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fdab543be---30686713419.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/nowiwibi.pdfIn PDF document text
    • http://citty.org/images/uploads/file/bixedaniju.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///xekulelunujonez.pdfIn PDF document text
    • http://gptools.net/userfiles/file/55247082084.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612681873ecc0---53739500866.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/57055439018.pdfIn PDF document text
    • http://mmt24.ru/files/file/48942086070.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161234fb4058e8---gupekokajoxufulumofepop.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/899c4d797fbb4e979268d9b0235fef0a/biwudoravizararubewiguwu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/nocsrl99c9me3lkhnb6m7qnncn/feladaberatejivadolob.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/24538303680.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/wuwosiwalulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fluoroquinolones+mechanism+of+action+pdfPDF 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_off0000ba52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA52 16460 bytes
SHA-256: 34095e0e07a280954cb50309c0573c62e7d4a4751caf820facbd907e63480b39
font_01_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 11108 bytes
SHA-256: e2675f6b5b66cfe6904d0977c23ef28638104cde8516e9b93c643465707ecb68

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