Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ace9a770ded295…

MALICIOUS

PDF

72.2 KB Created: 2021-08-10 14:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b98682e658c6e541a20660e0d00556d5 SHA-1: 08b2d5a9f089f43b24bca1c5b934ebec00e42f6a SHA-256: b9ace9a770ded295980d6515c21717410dbe074a2cbc65928c00c1ad687a06e2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=electron+configuration+practice+worksheet+part+1 PDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab241985428---pefules.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/6201298416.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160759392a3d95---16917628584.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1f27fa137a1edcfbc96eb7626dc03f1b/bafaxegojomekodakelilome.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c6a877d5---87847162713.pdfIn PDF document text
    • http://k1a.ru/images/files/file/renumon.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/582ve4cc75qagp9d4p75lh5n6v/xebalokugujetenumadusitaj.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b53d9131f39---sadutagotavalujidugo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4f0b59cf70d74ed8890f8a62047dada5/2641173829.pdfIn PDF document text
    • http://zimmerei-possert.at/68387754603.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210520113552_t3wxv7.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/46481520292.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/m5gpklm6rnt8468t5pm7no6ab6/xawanevagitigutak.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/835df8f040ca383586b358b9a406303d/gojefibedawa.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/p1eifraen97n7gldf0udbp5tub/jonuvokalivejomesurozi.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/18096181735.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/lanijotefage.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/60459574814.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/miraberikekup.pdfIn PDF document text
    • http://armanetti.com/images/68283405072.pdfIn PDF document text
    • http://katachizu.com/img/news/files/funobatijimi.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/volejomarilojux.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/25244386443.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/juvisugamif.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_off0000ba7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7D 14876 bytes
SHA-256: 790b3cc41294e3311c325426e2409161d78121b1e7a0d61217604abfaf3b6c67
font_01_sfnt_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 11072 bytes
SHA-256: 46f0f0948e04bc35f9d0e7b66dc3c1ca36b925d1af807eb542fc9cfd8ac0b686
font_02_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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