Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc50566135e82f46…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 06:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88471242ad5fb011509c349505f09e5f SHA-1: 97ec8ebff52aa10800bc611dd930f70bdfaf0d25 SHA-256: dc50566135e82f4677d4af572c61773933b224b636f1ffe2dc12b7b91638ea67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecc7352931---vazuxololoto.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613561c4a57c7---nawazeronalemad.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/lazekomejetasefapiwu.pdfIn PDF document text
    • http://emeat.ru/var/files/34061223706.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/42790551362.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f99cef3928378b9eae87cdcced7ea644/reposobefemazivurud.pdfIn PDF document text
    • https://vestol.bg/files/file/zatabinipunigilufibufuwo.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/59032236382.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pixewofipow.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/wirarajibawotom.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/vejefepizowujur.pdfIn PDF document text
    • http://freeorden.com/media/file/64476413552.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/26655299219.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/86405441133.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/ralugibawadopibapapenan.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/99264956167.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/48668393266.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/4912689312.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ffd1677321f619dbae5a499c2ce01496/55853847129.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/ziwugodot.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/sisosenigit.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143c8fde4b78---66509613579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+force+2.4+ghzPDF 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_off0000cf72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF72 18396 bytes
SHA-256: 98378350da4b6af30b0e795e3c6f7bf956721040ef9c2005590948f55d19bbb6
font_01_sfnt_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 10584 bytes
SHA-256: 4431f04f0afd99c435c6084a6b687ff07a9ebfc2f768b92e91147787bfc0b40e
font_02_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1