Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab612f51814f55b9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-22 17:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e66e211d629b2441c86a08d3224c5d9 SHA-1: 0f39efe7809bc131117ee9805b3e6aabd31bd2cb SHA-256: ab612f51814f55b9df55a0c38818bc1dd60e2941ecf329ad9eca591ca1f9afff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135a504559ac---51968908982.pdf In PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/66118579746.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/gojujevos.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/4939896697.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/rowalepaf.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b83b1f7f---jimulevetetamivu.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/19800565089.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/vikosojupaxovoxug.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/41990777692.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/64325769660.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a95d3c559ff8744d69f7292032f369c5/nozewonolebuzab.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/fupufazatalolab.pdfIn PDF document text
    • https://susta.vn/userfiles/file/xutadolizeworetewus.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/98190022362.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/93299130576.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/degunejegivaxaregafawulen.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/30947283420.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/felikulozupajojaje.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/redijipuporetufa.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3f9eced2---kagoxuko.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/jaxalopebababemol.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/97477178288.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/95478236305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+queen+and+slim+online+free+putlockerPDF 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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 11216 bytes
SHA-256: 8dfea0642db5939319464c4f5188a400c0b11edebd653242ad6b5bdbb8c694e4
font_01_sfnt_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 18348 bytes
SHA-256: b30143c67921ef23659beb07399c1c35396867056ad378b9da1ace7b7ed0200c
font_02_sfnt_off00012d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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