Malicious PDF — malware analysis report

Static analysis result for SHA-256 49be589d56fce5f5…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 13:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a05ac353ba80e165f7e1eeaaa71fde12 SHA-1: fb1ef5fab567c7af16e7c3c65ae0e3ed02329493 SHA-256: 49be589d56fce5f582755565ea1e573ddc9a5767702d873e1c0507359414e4b5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDF files hosted on various websites, many of which appear to be compromised. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and heuristic firings suggest an attempt to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://planet-pvc.com/upload/files/67455500214.pdf In PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/dozixalidixa.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3d81f33961d2e46e0f9521cf6b761516/defunujulufemogepaz.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/40566501470.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/37364673242.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3728791630.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1632002435.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/ladulap.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/p41qds10ep6ivagg2aoiqigdm2/wamesitaxozozu.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/28719215780.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478d5308b12---lululitapopepijew.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/28925230199.pdfIn PDF document text
    • https://taperagi.com/contents/files/lezuf.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614207c8a6356---28960162253.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/696a131aa91834fda4705f273d456773/82938731505.pdfIn PDF document text
    • http://zimmerei-possert.at/dudivesovesaf.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/rutononotasuxodol.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/99645633375.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496b72b0f61---17504286724.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/kipodufimaxefelazusukobex.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/frs5iomelafoiiigdjei0vrm3j/nelezojitipa.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/ranogirevalizuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gameboy+android+emulatorPDF 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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 10636 bytes
SHA-256: 333bfb0de1cfb6ef662a2cf29796ee54be249614a1a8ccc905d610d3d09d412d
font_01_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 17816 bytes
SHA-256: 7056e025359ac23c1b5829582199a8353a43378a1e66bd04ae8ec0d6c7c59ea3