Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1bbaaa1214c8be…

MALICIOUS

PDF

67.5 KB Created: 2021-10-03 05:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5700f8f5e6c2ba6c52636131b1e45ac SHA-1: c9042dcc8661e457c17ea48b8794ec9986c33ae2 SHA-256: ee1bbaaa1214c8be61e62282a7aaae4a2014f6cd4e91a41cddd2622fc16f9d87
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of hosting links on potentially compromised or untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615704eb54f90---dotidilobufokadebo.pdf In PDF document text
    • https://chingchia.com/uploads/files/202109191027457463.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/libupuxuvomojejobele.pdfIn PDF document text
    • https://gadapavimenti.com/GadaFiles/file/59286840068.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210902/1842223076.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f60c56f1bfc341f9acdf9925074849fa/besatej.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/gajokixokojijadawe.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/kanewukuxumu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/dikelafazewoluf.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/dudak.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/godaregiget.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/nudepitujatodigada.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210914/file/16315994271215.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614044b38f6c2---bujimulesuroxafopesiz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee37dd9cc7---zubonetogilunuke.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/lejiloxo.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/ruxometinesonejexagulunen.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/61068889697.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/98578781394.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109111927467761.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/47bf010ue8od3h9qrrp0d9ml75/sedinulufevabetaruj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=milky+way+time+lapsePDF 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_off0000ad5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5E 14432 bytes
SHA-256: 977e7cd925e1eee2d84ec3fc6e4ba3306e00f43aa0e9f7ce096651aa1f35299b
font_01_sfnt_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 10376 bytes
SHA-256: ed63e066e47aa27b840dd20a00ec71e0a67600e3e24a666287b471dac77471a2
font_02_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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