Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce52f40a61f0e086…

MALICIOUS

PDF

91.0 KB Created: 2021-06-29 01:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dd2c9ecb64b754c07b36607edf51f422 SHA-1: 94857c0f40dc237fb135e497ebbc33de8868e3e8 SHA-256: ce52f40a61f0e08658dc82fd81ace291b765c14104eb088aaee062eb83c42646
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous URLs, many of which point to compromised CMS upload directories, suggesting it functions as a link farm. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c6112d8ba36988df52213d84ede1440/14900241694.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/6f647ecad3104037418272f9f5ec8918/dawevaxofofozaxagegir.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/69101522128.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/somedifabalidojiba.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091573cc3372---10816999357.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/losiru.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f226e63430---57088336987.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606d098b609d9---terukon.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aafa6ca5e4---kijolibegusazexaxusix.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/192f50b9bf9df5b60c350e86e7e15574/61692555730.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/83206296004.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/lutodulobugemuri.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/040364abcce3984535bba2a302bfe8df/zukeviwigelawi.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/ddc33f4197485c17a67d029c1dd449da/kubaroxoweliz.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d19a7950c---golavutubudoxexow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c308adee9d5---fenasumozaru.pdfIn PDF document text
    • https://digicpictures.com/downloads/38180681861.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/5ct43330gg8m2rr9ht8nm3rbbf/41257388727.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/nukaruwovepofeboluvo.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/sageworunafuwajejivi.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/liluzasokepizono.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c1e6c2a44fe86543b9d6c00c9748171/72811672014.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/sidanok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=definition+of+joint+tenants+with+right+of+survivorshipPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B0 16948 bytes
SHA-256: de08477cb2f6246986548fec66b6edb0e4149e8682cba488622fee9d447e01a8
font_02_sfnt_off00014500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14500 10972 bytes
SHA-256: 18c130062ce1df34a1f7f54514050a73fcaa3363e2afcf65f27efc7380b7f39d

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