Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0955989b6d2153…

MALICIOUS

PDF

93.1 KB Created: 2021-07-08 02:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04cd4728fd118a19e80ad13db3f6a34d SHA-1: 38090a7fd724b4049ee8f9766226acb2786fa35a SHA-256: ce0955989b6d215335f85516077669566203c68ddd1abc368dceeefe39118131
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious or untrustworthy content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The file's structure and link farm nature align with common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • 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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1a68a7e6592c0aa04e2a329d3ee2fa39/29516442429.pdf In PDF document text
    • http://banghetretruc.com/media/ftp/file/97226394698.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/korisuveja.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/xazitotomawaf.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/xiburinimogezizofexozum.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ea6a25c85---vurimuxejedezakesuzem.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/xokitinigugojir.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0f91a753---xawefofigudibutub.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/nirelojisejibin.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c45bcf2b04e---93858505263.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607693f61f26f---7996339345.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1163227e38---nufewosuwo.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/49801066090.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/01c0f981eb01b23e915490ed3cb99654/loxijituxu.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/64612410603.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cf8cf1927---najanukuzowugexezotivam.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1cea7c9ee---10022089655.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/sutikole.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b7440867bc33749423321d2f1c01e44c/jomugivoxuwimoz.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/38137055553.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/22113937415.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7f69c89f---xupimufuwawefemaso.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed8d9c4e9---88274549401.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160df1b9634c62---28710511460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gold+silver+prices+todayPDF 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_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 17908 bytes
SHA-256: 490bb09e0df6f7dabe21afb9385a6b0e70725b9c40cce5972ea0c3150bc07e9a
font_01_sfnt_off00013696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAD 10624 bytes
SHA-256: 695f4f962ba27e730e1cdebcbd196a0aaf5cd1aa4414fb7d68b3a3289cb10af9