Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80745615c58bce6…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 08:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea672067c42e7cfcb7eac740d98ecefc SHA-1: 463a2111bd6566293ef6923bece4022909a0b2d8 SHA-256: b80745615c58bce6c92c8206a90e89a277f3e37b78b5a8fe63380717a50978ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://maslag.eu/userfiles/file/katidebererisasorajawez.pdf In PDF document text
    • http://fapannimario.it/userfiles/files/24266688623.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96a10815b---bigasiwazajitudonibovil.pdfIn PDF document text
    • https://5uempat.com/contents//files/46035469733.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba674d51c1c---3398271757.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/jetat.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gapelon.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/dizupewedidoto.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/neridemedetifodux.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/junaworivosex.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5825ec4b8e---67675319407.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ceb0b7ab---busemeso.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fdff705afecc3251d62252589a464a86/tivasanefugunebiwuf.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8851b053c81f9def4f242a29ac89aa55/nodaliruxovazu.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/74c25d0cb7cd9ef5ac3f4039942edd9d/41268489978.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/53336577759.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/gopopepuvamebupumig.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/117a2f0c095d49fbc1fe9e1634362915/tixusujeredugaloxupat.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a43dc491a4a---33291511995.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d41ed5d3---kagufevosoxapujowuzexem.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/renujavuvalelapotuxopuvu.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/71693203286.pdfIn PDF document text
    • http://ibb-online.ru/f/file/peboworedifovigelolajow.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/wuwewisiburenuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=amazing+selling+machine+course+free+downloadPDF 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_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 17544 bytes
SHA-256: c4d6acfc593b92c0144b8a8e1dd806bf25705d9fe769b50255b1f59a87fa0cd0
font_01_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 11052 bytes
SHA-256: 130eabf6d07e81f4ddae9fd0d590b3a72fcc60e441f0bce0173d937f61a4ad04
font_02_sfnt_off000133f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1