Malicious PDF — malware analysis report

Static analysis result for SHA-256 e058065aea2ce461…

MALICIOUS

PDF

85.8 KB Created: 2021-09-22 21:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 107f6d163f6d2e5eb61383d00841b7fd SHA-1: cf84f39b67c287e757ce849d8ab6c4a45278e71d SHA-256: e058065aea2ce4616da88dcf0641d25b94f01f444d08b39d0b1f83bb735ce18b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document designed to lead users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://beauty-full.ru/uploads/files/75126344194.pdf In PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/galivozamabajuju.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/8856794756.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/pasebix.pdfIn PDF document text
    • https://selispin.net/calisma2/files/uploads/41540376370.pdfIn PDF document text
    • http://bdn10.cz/files/file/5991906217.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/5855698590.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/tekonewoge.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/daxekokawakutevig.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/jikapoduzi.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16133e915ba33e---jivulewunase.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/21363037489.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f3be7733---posetedizigeribojixiruder.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7292d6358---59302425320.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/tabitaxotapugezugotox.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/kipafizezemaje.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/81800683933.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/beboruzaxukedeg.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/24640731897.pdfIn PDF document text
    • http://saaretravel.ee/images/file/21418012887.pdfIn PDF document text
    • https://tele-video.ru/upload/files/43842830714.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/61081844330.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/7814922944.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/27392511837.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/qf8gbfcrdqfq023rn8pck9vvt4/pomopizufazawikaxosiwemux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=application+is+not+responding+androidPDF 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_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 10672 bytes
SHA-256: 7069d6351f043b5912b91c81cb9eb121e83872c071cb1646da724dd5a27f86a1
font_02_sfnt_off0001183a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183A 18368 bytes
SHA-256: 5b8c7f4bb30b983538448a91a4d08b849e1603bcb5f386c54c64537e46b07a8b