Malicious PDF — malware analysis report

Static analysis result for SHA-256 29507dad76c39bc3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 02:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99d111d1c9fd12fb9bf71bb31935813d SHA-1: 19a73b48926de9707dd77748a0c732f0309608c1 SHA-256: 29507dad76c39bc35ed32c16e05f885ad5131bdd13b4a6b264af7fafb7b614b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5af5a0434bf7314d14ce5573577ff440/diwuxipakiromalore.pdf
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/savevamujudotorezuwesora.pdf
    • https://dyaa.club/uploads/file/28397834998.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1646143c4d7d3eb2844647efe107eb41/26507833229.pdf
    • https://mamotato.ro/userfiles/file/wipenuxiwemiwuwegusa.pdf
    • http://soupworld.de/upload/file/41906061693.pdf
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/22697627988.pdf
    • http://jyjwqj.com/uploadfile/file///2021090618163446.pdf
    • http://huarui-bio.com/upload/files/jodaguniwok.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/ketudasutitekasasupal.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/napifabo.pdf
    • http://busangh.com/attfile/fckimg/file///2021091974523_852637737.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff443083a2---nevibufaref.pdf
    • http://enkepharma.com/upload/files/651043586.pdf
    • http://herium.net/FileData/ckfinder/files/20210906_D22F38051F967455.pdf
    • http://nutronicltd.com/userfiles/file/jamusepelenejepe.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147aad6277f7---87904613800.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/34886588036.pdf
    • https://fleschimmo.lu/userfiles/files/48153942228.pdf
    • http://wyadonline.com/userfiles/file/35973918644.pdf
    • http://thegioichuyendong.info/app/webroot/upload/files/gemigekoxewi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sultan+movie+torrent+magnet
    • 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_off0000dadc.bin
97c0a01049e8ad51d217110a9a93173fec32c087d0d45599dff39a81368dfd8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10524 bytes
font_01_sfnt_off0000f2d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes
font_02_sfnt_off00010ae6.bin
4a494f83318063d507f560d3c915cd2e82a95690075c1c51145fc81c86cfbf4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 18252 bytes

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