Malicious PDF — malware analysis report

Static analysis result for SHA-256 659a61840e73f61a…

MALICIOUS

PDF

96.0 KB Created: 2021-09-11 11:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e12e67105ca954a31e48d84a987f578e SHA-1: 77b3ed6b63f3571f766cd95e3f82c4832b96d0e4 SHA-256: 659a61840e73f61abd232247dd92d4568bbe76fb78baff93f528257574e3cb2c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further payloads or provide sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/t8p56hrjquqrmi2jag8cnmkc9j/bevisomukazumodit.pdf
    • http://ehoron21.mn/uploads/files/fulogubepina.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/tekufitewefom.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/13797722130.pdf
    • http://teranor.com/ckfinder/userfiles/files/xegebodusulod.pdf
    • http://startmatbaa.com/userfiles/file/zewekituvakupisekuvatij.pdf
    • http://liga-stf.ru/i/upload/files/duxawibutolomef.pdf
    • https://tommytest.dish1314.com/data/html_editor/files/43090129115.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372290c6a02---65745853188.pdf
    • https://emailing-online.fr/uploads/userfiles/file/74066233862.pdf
    • https://aldwalia.com/userfiles/files/75116430816.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/35729366580.pdf
    • http://wych123.com/upload/files/3923313481.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b83523fcc---97610280960.pdf
    • http://www.ruben.pl/ckfinder/userfiles/files/61561344227.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/vurerefol.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nixegiwikukikufawek.pdf
    • http://upservice.expert/admin/ckfinder/userfiles/files/ratejejiveluw.pdf
    • http://iccjsc.com/images/uploads/files/tolugonugugigabusu.pdf
    • http://leaguengn.com/userfiles/file///levekodolojit.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/814fb6cb2e3cc2dac157500bc4ed4310/bovegerelafuloxarorewa.pdf
    • http://katachizu.com/img/news/files/80730218042.pdf
    • http://sattosushi.com/uploads/files/93459865963.pdf
    • http://bloodfaces.de/attachment/file/30814558281.pdf
    • https://alpasol.e-giant.net/upload/files/61266230900.pdf
    • http://adwokaci-pila.pl/userfiles/file/56924381044.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=this+is+us+season+5+episode+11+online+free
    • 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_off000111c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 16792 bytes
font_01_sfnt_off000129d2.bin
1ddcdf322e50528e3919f95550153eaa345d0b611b8ef85260cf4e94db5c0d05
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 18084 bytes
font_02_sfnt_off00015921.bin
23359fd59baa37261fcadde1c1ffce4e74549b9155f58532f819dbe5b1f6d13e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15921 10748 bytes