Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a35ec52334a750…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 13:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1efcee6c436650058dc7b4728e262755 SHA-1: a819455fc82bc81de551638b0557ae64aae61960 SHA-256: 65a35ec52334a750c80ed67e0d411f7db53e2f7115cb5f6826fb5d73c6cee3e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs. Many of these URIs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The embedded JavaScript likely facilitates the redirection or exploits a vulnerability within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=axway+mailgate+manual PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16072d06743af8---jizotoxi.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/41273697520.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kigeluduxuzopizufogax.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca95c59a1---73158825035.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b34fba090395bffa074e8dcd11a60225/88589128341.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/diduzekiv.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/zoxovobudorifodepaxik.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8515a6996cff64405948a63b8b236370/92336722290.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vos0vjn2prhnoj913tdetlu7h3/35067982666.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/folexenajuji.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/91131524406.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/zimulutar.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2aca5bca---75584528275.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fv2cjf6nb85h9gmvet4jugq9bh/63292479359.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/50987880284.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c70676e2074---25822805582.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/vatesoja.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0bfa6a5eb57d14a1f61384c9efcd313a/sosubesubotaxododo.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6909bdd359---70638351188.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6791d8730b7f29c3e70f417ce416d0f2/zelelo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c744d639db7ed7a0298379f3afb3d06a/96043864748.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2d59732fd---fimejotifokabefavid.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xejovalowowijisonuvamel.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/45364871433.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_off0000c5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5ED 18884 bytes
SHA-256: c51ede0fcf003cb608cc636fb275f68ef087fb3e6cf948eadf09e64409764fe1
font_01_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 10444 bytes
SHA-256: 73182a1fae01cdfebad32134f6a76fa541edece0c20357d0229dbacbb9c0f25f