Malicious PDF — malware analysis report

Static analysis result for SHA-256 623ea23dc30ec28c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-24 02:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e567b30bdea118c57528c121b6339e41 SHA-1: 1418678dd50e93337d6ca6adefd4f89fe8e18b3f SHA-256: 623ea23dc30ec28cb52c1f9ba6780a21b388e077b91c5ec2b8a245d6937ffead
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm hosted on potentially compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=mario+theme+song+piano+easy+letters PDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161435e14c82a8---54775090978.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/30599550444.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/52807159582.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109050233216324.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/zemasusuvulowogogi.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/90170843971.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/zilasoboxisuw.pdfIn PDF document text
    • http://dytac.hk/userfiles/kakobejixinitelofogegopek.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/46223177444.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/pupagikupegoligef.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/depisazisowigev.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9369783ffdb20dce26abaaf4d05e7e57/73023149485.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/81337130275.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/58830150417.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/kipumutitedemimalapox.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021971051468724.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0e70d753af501c6892669354372d587f/28596859352.pdfIn PDF document text
    • http://billsky.ee/files/file/fudelo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613391bc276d9---dumizuwoxafu.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/bubipumasivejafe.pdfIn PDF document text
    • https://arendic.cl/files/pozepejetikojorojoro.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/felonoxuxamoxodis.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/43066228776.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_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 18668 bytes
SHA-256: 43d2d492aca65167c31a341e5b05272c397f92e3f8b765406ba8276315aa84ee
font_01_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 10804 bytes
SHA-256: 1d10feb3bc90ebdcb754df93043010beb10a6f51345b3e07b17b1afddd1eeabb
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.