Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aae4f523307f159…

MALICIOUS

PDF

87.9 KB Created: 2021-07-17 23:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ee7fa2410086b0e7fa8fe4074cee76b SHA-1: af116d8b457afefa54348c9128222fdd36295446 SHA-256: 7aae4f523307f15915ff94c668820c61057419196465fc4318f3f1b937a275f3
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of numerous external URIs and a link farm heuristic indicates a likely effort to obscure the final destination or distribute malicious links across various compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://masini-de-ambalat.ro/images/userfiles/nawetalosetowetogesewep.pdf In PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbb8dd5642769b2448bf8bc8adeac3d8/3474532862.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f071f6cc270---feritifejefigakorule.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94c7954c7b---63147748136.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/gidoberebugofitupuri.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/180819292517.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c5d30776ed1bddf2392910acaf5c4d1b/27516765747.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a8157578---10785888033.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3658380eb4---13387643027.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/5itco1pns2u4h41oahlf99kvs5/likimovitovosukupapufekek.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8c64e7de445e7b60d8d87a15b0f96520/jopuxamisaralataxo.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/xifakegekagalu.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///gibifun.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/gazemedixo.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/walavezofazesiwigexot.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160900e28af17e---mebijuxorujekiba.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/39edd9acaf410092e2e2d98578940858/2597432118.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/61558315611.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/4s2u7kkgk4307t631dhk2rvgb7/82398238694.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abe65c5ab---jajufirunorivifegewoneg.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/morafofogugajibevatiwu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925671803b---89764424881.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104290530134278.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5767e68baaa2bcdf78268e6df840e702/buvoxijepexovanadi.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/9ac6185eb0276a91aaa33b2bb2da8358/54520232532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=surface+area+of+parallelepipedPDF 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_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 10420 bytes
SHA-256: e31e2b26cb3183dbd73fd4c61b000d253790f1a099f6ef8cbfc8708660ada38f
font_02_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 16756 bytes
SHA-256: c8dc0fc5c5607b7a9bf5e8ebe941a5ca0e222c071ca322c5d95878ea35d45d95