Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f868a844fe0d27…

MALICIOUS

PDF

82.9 KB Created: 2021-08-05 02:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ea650aeba7500b48cb7455a18acfc38 SHA-1: 65cf7e0f73fd61bb1daa1229ebba836e24ad8067 SHA-256: 83f868a844fe0d2744385a0bf2d8b2a7e7bcf76c00a840a89679a3feea6d88fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to potentially malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://okna-kursk.ru/page_edit/_samples/userfiles/files/32458124382.pdf In PDF document text
    • https://sy-tech.eu/file/59813477264.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eee596a71---nuwowix.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b7266c43---61875109489.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-29/20210729203537245708.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7674d4ec---16340014226.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/13751751304.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082d4d7158a0---denadedetuxixirumez.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210508060841.pdfIn PDF document text
    • http://berbun.com/user_img/file/87538187867.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a3ef0594b---58576006202.pdfIn PDF document text
    • http://gujaratbusinesspages.com/userfiles/file/96204007748.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/1331016445.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160883dece5f82---97863966407.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20136066350.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/20075589988.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4ee298fbafc9a6c6d45c7c39704fe87f/nekurirunekawinefug.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oeh7lqmhdheqde2ip0os90nmv3/puluda.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/91133174860.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/17581418363.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ed28486ec---xajufajilab.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/d77638cf8ebfb1fffd1e588595ca7ce1/95694695116.pdfIn PDF document text
    • http://co-mit.com/uploads/files/48796230229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=guitar+pickguard+templates+pdfPDF link annotation
    • 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_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 10972 bytes
SHA-256: e2aef3edf862df063200eeb84ee13cb667fb41081e531d8c9cb2735847d549f7
font_01_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 18076 bytes
SHA-256: 53711d934acc4443a95a53eefe640c22b4797325e8089be3ffddb588fb12d2ae

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