Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e9d8aef92832bc…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 18:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bc75d12fc61c54bb1fbc218766898c9 SHA-1: f44da203e7794c192dfafc2984b05ad8310987a4 SHA-256: e5e9d8aef92832bcdf4ed439673eef69f85f7658f09962853e4ce303c20635e7
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 CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hydrem.ru/images/file/44297838014.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bac54795d6a---kuxivebided.pdf
    • http://lawrence-spruill.com/clients/42275/File/24896255249.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c926b070f---porikoge.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0582d35aaef8a5efdf0ae31020facce9/gopofurufabomej.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607793f919614---37178969023.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab273ee5353---vipawamisenemidexugodareg.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/aebsabaoa4l47l59u00clq0tfs/narusakijekareje.pdf
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/94709505713.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f219fd106ae907f706043146a7553fb9/27326604404.pdf
    • http://moonlightmontessori.com/upload/files/xazev.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acba770049f---54716708692.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609137ecde1b9---teresatobevisenepej.pdf
    • http://manavpublicschool.org/manav/userfiles/file/jalugudasonafuwad.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6833fbf7b9---96022857802.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe9684c562---57014185655.pdf
    • https://x-software.cz/data/file/buxukesekifud.pdf
    • https://readandenjoy.ae/userfiles/files/rezinikopomedeme.pdf
    • https://iwanbim.com/userfiles/files/nojosabadegasedupovad.pdf
    • http://qunjl.com/userfiles/files/ratidalutumunodonirupatum.pdf
    • http://stlnsk.ru/uploads/file/79828701958.pdf
    • http://beauty214.com/uploads/files/202108310648271339.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1611e7aa10fc25---87868105195.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e8b4b0a3---jazikujakipej.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/06a37e4fa63a79a507e231fd69e4b3ff/xoxon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=unseen+passages+for+class+2+pdf
    • 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_off0000deac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 16792 bytes
font_01_sfnt_off0000f6be.bin
f0f6aed0642c69cc312d1ed9b9a732962af14a6b6e678d08281eb9b313e46a34
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 16832 bytes
font_02_sfnt_off00012284.bin
5558c651997da5b466b6653ff47b22de06f8ffd02474ab6109e0334164f98b1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 10732 bytes