Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c4e7a28e464a69…

MALICIOUS

PDF

128.0 KB Created: 2021-07-21 21:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6776761470b2125a0234f24b73cc2c3d SHA-1: d1385d9dbed5be02342c284718320ddb37c8646d SHA-256: f3c4e7a28e464a69b3d77b5ed1ff021fc7cdd1bb9f122fa93b347253f05a2bfe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5166

Heuristics 5

  • 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
  • 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://skyline1968.com/clients/74864/File/35528997358.pdf In PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/39717579405.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/95808225056.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc7e32a49a---82729687688.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/939e8314d5e0a797a08fa2a9e764689a/42134911969.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/353370987d223dd475d2d8ade458824a/nufiwuvitavabedaduxin.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/laguxaz.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb7a76b390---buwubavirerinopawunop.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/95481690848.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/830f011c68f2bad2606b6ae9a23f6f05/61605903303.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d220e522375---julufetufesuwila.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/vusalimeluzuzoxewu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/es6oni52c3rf7gufkbc0jt1c7v/xamotezureve.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6fc5a9609b8b772553bbf9093216a7d2/saxebivuroxafusixemoj.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/49806635284.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/32530134245.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7906ebda9---wesafijomuwurem.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/0r7jnou5gfqko9o2u6bokkdsvc/rewonugufa.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/sixudu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607df842aefb0---mozezaf.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924539dc241---lozunezazixob.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/21095861966.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07180873c---26927410754.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/lujag.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5bfa0595a---80178295073.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/vadanerewetegum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=powers+of+numbers+chartPDF 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_off0001b7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7F3 23988 bytes
SHA-256: 1acebba377ba39774765ef67e1f464f9aef62bb3b6251315e3d89d989afd01c9