Malicious PDF — malware analysis report

Static analysis result for SHA-256 141ca74e220485ce…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 14:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a8938815b39a1216af2ef749e5d3fb0 SHA-1: ef53ae247687fd920b51da35647534c9bb5ca4b0 SHA-256: 141ca74e220485ce30d9dfc2bbe03fa15e78f609313787c239822deeaf852b5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pixomot.ru/uplcv?utm_term=grade+2+math+worksheets+expanded+form PDF link annotation
    • http://realfootball.gr/userfiles/file/fuxuzo.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/86226690597.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/595d0d3494a4dfe5a643fd35d27fe609/lafekaxirepawaxikubim.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/60484658426.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/05918b80bb17e93cd1b272b5066b62f5/zowakuri.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/62173698043.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/c7289446bbb734c090d52a7b26a3ca0d/nizavijipiganamu.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/tidetipodigolarefuzu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/86vs0koglk5dmbhbpobmmhoa30/rafemipituru.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/88269690653.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba50d76300d---44384605400.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/sedujekuw.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/70594253173.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/27350204835.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3035a60f---rukepuvisivesoli.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a4684f5d---34664245156.pdfIn PDF document text
    • http://ipublicity.cz/data/file/18681863988.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/37540330407.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/q2ce7shgkj5nv8r1uaf22fisas/80463377117.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/ketupemonelopotenujuwoja.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081be2e5aa08---74473281398.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/2168070620.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/gabexisuzofafimizab.pdfIn PDF document text
    • 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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 11064 bytes
SHA-256: 83047c8936a734608c3a640f7b21ca65f2c2b788a09ea04929c2ef05cee2d2ae
font_02_sfnt_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 17572 bytes
SHA-256: 92e2d03b7a5eeea75ad944fb02e22f76b7e95b00f6f6ddbe22d891df8d475ae6

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