Malicious PDF — malware analysis report

Static analysis result for SHA-256 904fa05a5f02f066…

MALICIOUS

PDF

70.3 KB Created: 2021-08-06 08:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22bcf5893ff26790b95d576bc7c02f88 SHA-1: 35287e0e05ac7f37467251e2157c9399bc163c15 SHA-256: 904fa05a5f02f06647af945c05e7c27f398bada286b670c7ee52fb0adc66c242
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to PDF files hosted on various domains. Heuristics indicate this is a link farm, with some URLs hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9538

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 https://trexanh.net/upload/files/mogapexarunofavosaxofu.pdf In PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/37341017191.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/61002768562.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/detabavabavo.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/82728174012.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/legarixibemokobedovixus.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/fagibo.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/netigaluzitaxutotutigimon.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/tebarilurewadeluzojifa.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/puladaxebotutilenoxexijab.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d1abd7e8f---31908761446.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kumotiki.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/26814a6457f798dd1565b1ba914d2c3c/28170990881.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/jefati.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/nemaj.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/57957301517.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd57e30de7---jivutadifu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/1pjepp8slqlohfa69ii6fgv1c0/67946720755.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dfd2561bd---48096063233.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/25834775609.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/13717575259.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab007d4f2f---65175031098.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/05378e76440aaeead0d64711429352d6/65335202464.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/3693434261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=qyt+kt+8900+manual+pdfPDF link annotation

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