Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce53259243c15b62…

MALICIOUS

PDF

90.3 KB Created: 2021-07-16 22:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 60fe65228a66569d3aae397ac3243c56 SHA-1: 74fbdc06a4e5c92c92fe7d4ebcdd6c190e4cd8d1 SHA-256: ce53259243c15b62dbbbdd8df143a6298d678a07fef8a847679594102316e8d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on compromised CMS platforms and disposable domains, likely intended to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cc905cb12afa261a7f5d0e56fc2f8a7/85263737883.pdf In PDF document text
    • http://medi-sen.com/files/files/6701891749.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/zivesuvobu.pdfIn PDF document text
    • http://pneusmarene.it/images/file/57412676930.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/73509241447.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/xulowogevalazalibesexom.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/99334358189.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4374549e41727aec0026e104809112f8/ginanojed.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607330397849b---vasuzezixovinasagije.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dheeoq7m1632cgo1vnb4gp9r20/39014193131.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c77d7bef2bb3aa622b0fb696948dc97b/13902477199.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076516db0a2a---70796460926.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ocn79fs7lk8salctjfv4qcc051/mugazu.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/37701606995.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/49932092069.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43b4b9a142---56944583883.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6fd2e3702---97728746578.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a6ed2c3d---13031970921.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e7341533---ginalusuxoligorexajubot.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607382a89bca1---99987702970.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1e16bf33fb70f07eb3f8def8102ce23e/82045130758.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16079c783b3380---47053126194.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac2cbf8ce---vazenogedavan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=class+8+science+chapter+2+mcqPDF 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_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 11024 bytes
SHA-256: 3f37278e820ee58b8e3aa9054ec74f1223656cb63587bc68ec6158bc7e025883
font_01_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCC 17556 bytes
SHA-256: 2ceb4244bd25ca020326d51bc90d0343cd210b57404a265f16c8962f5d12979f

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