Malicious PDF — malware analysis report

Static analysis result for SHA-256 557291ebbdca5288…

MALICIOUS

PDF

83.8 KB Created: 2021-06-30 09:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a5f77b9a0fb5eabb02a953314c6e1d8 SHA-1: 21541f8ab4d8e5f991c9b465e26e507c88108895 SHA-256: 557291ebbdca5288667b2f630680f0c1b886708bcbaa48d5e096c8fafd10da7a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b633a6c6a8e---57370942683.pdf
    • http://ibtaker.ps/userfiles/file/75634868359.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ca2a7df9---61662130945.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6790bda048e5db05a31e006cb7b7796e/kaxurefikaxor.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/varumapevefoweka.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/bulebona.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aac6048a642---kixawexodikawajen.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/281fb91a16c67cc6578fa12aa9ec0cd5/dolezutufubupejolib.pdf
    • http://alpha-th.com/userfiles/file/wegavebevusapafapeni.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ebdac5a1bbd88612a96532acbd6ddb73/bivulatonokisuzibevefebem.pdf
    • https://giriconsultancy.com/content_files/files/89517141805.pdf
    • http://airconbank.com/upload/fckeditor/file/48806474774.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baab07f0c1f---36819287410.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/pc623a5e72of5l6c9bck0n4rnq/10512980968.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070336470cce---konibuwosovofexewajis.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1e09aa4243a8b345182afa04d052b1fd/68276170473.pdf
    • https://irrisyst.eu/files/file/xatowunebuv.pdf
    • http://usmleworkout.com/files/file/406865419.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0b6c6eff3f9a5fb08d4c32d87892e662/jifubulizezuzanusifo.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lde64bl7qgjlskkdu6i8usaml0/sumiwupefega.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761a9e5a812---mapikibebus.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1b0e100c4---55966154333.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cceb8c75fe8---81951485893.pdf
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/2450732850.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=at+what+height+above+the+surface+of+earth+the+value+of+g+decreases+by+2
    • 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_off0000e19b.bin
7cac91de290c4f2c1f351065627621ec97a1a4de77ef087900572d62f0f8ea95
pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 17020 bytes
font_01_sfnt_off00010e44.bin
565ab3d9a4218a3e8e28d19816287c484df832f0ead9dfc1aad9d5f1630d74c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 11260 bytes
font_02_sfnt_off000128c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 16792 bytes