Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f7b974275351bd…

MALICIOUS

PDF

71.8 KB Created: 2021-08-28 18:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 1002dc31135f0e96fd2461f7434259f9 SHA-1: f3d35838e0754974edd98919120ea9b32cea88f3 SHA-256: 15f7b974275351bd7a0c9209ded9231161858487713b00f0e5ffaaad37838ecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chromowane.com/userfiles/file/jijerazenugidutonosubevel.pdf In PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/ladiviluwinubabosoragumo.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/dovogupojerupu.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/mebizanud.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/24200841396.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097c54de9bac---jafomore.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5h60h4dn2r24t8grv38jgr57p7/99013327273.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/85487866079.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a0403f197fb---jirexubixifinem.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/fuwitox.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/94562106456.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/71274787391.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/damozujofagem.pdfIn PDF document text
    • http://446888.top/userfiles/file/vidusakuwiketulikisuz.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b8ed301b---51947723877.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rofuvasezi.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072f2870498e---89489931886.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/loxisuxipewexuxatexawavip.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2lk45ebqd3k15bagj885ve89sq/92400089098.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160714fb715465---87096324918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=it+chapter+2+free+onlinePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/45b6700192b2c28f2f6443bef4c8a8cf/14895877949.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_off0000ba43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA43 15508 bytes
SHA-256: addaf15fc9a036281c4217ac97e6e5139809b925f8bcd2cd6e019cea4c01f05b
font_01_sfnt_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 10480 bytes
SHA-256: 09dc03b192d894cb1a82b5cee84e529390296f286536f372a7ffdc7fd9d59bca
font_02_sfnt_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1