Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6f03ab30312fc6…

MALICIOUS

PDF

62.3 KB Created: 2021-09-05 04:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51ee20ff589e2f1243bd222e796113ca SHA-1: c17d50b8d60595b41cb91016865c6ba40f195a0e SHA-256: da6f03ab30312fc64dc30bce457be0e63ddd9adecb1b4ad75a4275bfefa4714e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, distributing links across numerous domains, some of which are hosted on compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7991

Heuristics 5

  • 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
  • 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://gugugroup.com/userfiles/85042754946.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b7c27bf2f462ea24ad360391ca870b12/6920819379.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/59080671450.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/22912160444.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/50594081422.pdfIn PDF document text
    • http://51www.org/uploadfile/file/8daf627adbad38a5d9ba03e1ba81e1f8.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0ca8a170---wevixokijaramafe.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/zikadituporub.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g7s8b39132j1bmjsg6s34gfhsn/76309336938.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804e7fddb10---suleletewimelemagezo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pufonawevug.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f1f486c5f---punijorager.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/88207847549.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/4135e2cf01f89b0d7d3013a393094d7b/xovozurazunezokuz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094ea1c309b9---fiwanagoruterun.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f690e765fe2---78950676089.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70739754670.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/p2flqa49tqr5ou8acmhpit9gso/75732884651.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/ladowodugemibugup.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/18629013522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+to+dwg+converter+software+ukPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12F 17828 bytes
SHA-256: 0fa140cb48a0ac05326b82cdf9b1825018bc116bceb0cb6505f740f550d31a13

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