Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc33a58f7ffe93cf…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 12:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 463ad4ba03e70ff6fe5f6279674a4c9e SHA-1: 715cde281776b04481d6cffe85b3c4aa3e84391e SHA-256: cc33a58f7ffe93cf0c0cd92aba91edb1361d8eeea073f76c548db35fe2f28b1d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on these external sites. No scripts were extracted, but the presence of external links and compromised CMS uploads suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

Heuristics 4

  • 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://oniceh.ru/uplcv?utm_term=how+to+read+an+acceleration+vs+time+graph PDF link annotation
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/kunalezafasulezova.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa13662fb---zodizoduneb.pdfIn PDF document text
    • http://lejonhund.com/upload/remaf.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a0b260cc2388a1157c9eb4f175fa432d/83508302845.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/bamawovesonitazovevivugug.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0b517725---29916307196.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/46044073549.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210829133648_1506600207.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b2a49176---lomatuj.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/zigavuwitipik.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/234436396fc57d57f567a22b1d007232/66735210427.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/dusafekuketuda.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c44d61521894def96b931327974b4fe7/fidesixivunexu.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ube2cgb2pktvf6b4ftebcm034b/32110899361.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/loteluwitot.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///12818498674.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/rufukelijurivazoxose.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/bojel.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/susepixutud.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/93418854937.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/remupupolodezapoz.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/xasulisatakufabej.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/tizapukipezikiruf.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0dee8920a---28635451591.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 19004 bytes
SHA-256: 0714e7f0e0aa32f88c2bab2497fa24d1275ddd81be5c97f76719c9d4219a9e8f
font_01_sfnt_off0001400a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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