Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d71d2925e6ebaa0…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 23:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6710fb0e5a3bce7bddff4d1e47ad6fa9 SHA-1: 4a6f2c5e001eb9c6e7c83cc59c136d8a8ec63748 SHA-256: 2d71d2925e6ebaa0e8f65d2e5c0f3bd4ee937d5a5c45d42e78cab6afefbe8257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://queure.ru/uplcv?utm_term=telugu+movies+in+mx+player PDF link annotation
    • http://massarentearchitettura.com/userfiles/files/zoduluzisarop.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/30514235882.pdfIn PDF document text
    • https://stopserv.ru/files/file/35774237788.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/janoloputujapipig.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/bilabinoronuworisokobe.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7627bd1ea---63785306737.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8mpc8hvustd6hspbmviu3kgjn7/vinekezopibovazipuxituna.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a05f103057c---41850343874.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/kurukinixagazitufonejuse.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/93584857694.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/78502389896.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086a3b0ce71c---sajamido.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6e8dce7d48971d9c680f911ccf747e9d/62515060439.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/molibisigudenamigi.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/4b89f3bb5295623d12d7501d5a3dd63b/nufopetonemetesavivu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4d245143---58119411768.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078effb3d91a---devemom.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1c3541d5---99092763046.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kasosoxebavorujiduketem.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8160a7f70---89294189470.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905a3e5895---golisegotagesufuvezizeb.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/k17tq5079jgtjqok6bqn8kefu7/28748906209.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452143d525---32890529964.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/konevavikufofarudadumi.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/mobif.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/gofuziwuzasina.pdfIn PDF document text
    • https://btegypt.comfile/97175519112.pdfIn PDF document text
    • 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_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 10844 bytes
SHA-256: 7b5c933240c19569d6e56e8cacc478e8b0a2a1b67c0999b4640cd441368a1e89
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 18052 bytes
SHA-256: c8f8fc2d0d32a14ba8272eeda3cf87a941e0f789dd0eb71b106cd8db482395b3