Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c487eae33cbd50…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 02:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae51e3dd1edbd763c2160831bbd71949 SHA-1: aff54d18a704bb79e73c6ded6a70a8a99d265e65 SHA-256: e4c487eae33cbd501408b1fb575d7374cb1d26bcec4eefbf7a4d4ec22134ce70
96 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to PDF files hosted on compromised websites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to lead users to external, potentially malicious, content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://pistant.ru/uplcv?utm_term=pression+osmotique+cours+pdf PDF link annotation
    • http://longvu.vn/Images_upload/files/73249176357.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/xuviti.pdfIn PDF document text
    • http://dnepropress.net/files/file/35213115987.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/rbc70tievbatfej9h69a92r82g/30748432791.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/fb39221b509a5766a253a30251258eec/mojisitil.pdfIn PDF document text
    • https://jcpcdesign.com/upload/ckfinder_temp/files/20210704104858.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a435b811---dalor.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/85144688967.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/jatedimepud.pdfIn PDF document text
    • http://runhouchem.com/upload/files/920303301.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/jizunerewagatenugamo.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/30146477592.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5rnd95k03sid6ki10hoej1jcv9/nepoxajozimo.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/magosugedukapo.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c61007c00ac0dec224d90a089e2f944d/34409048313.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/1169660406.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/dofujoba.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/39909661038.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630631964.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3m6r8n8drpeekvf3bddhqssleq/pasirolijex.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/59015189790.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/99e01ff9e7b8d3216e1c474e8b0db768/derolilujinera.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_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 21096 bytes
SHA-256: 50a1a70b083118a3a09793c376d8c8f94e238b28ced1bb23de10d6c7ba5b5b1a
font_02_sfnt_off00013126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13126 10820 bytes
SHA-256: ccb8b21fd947f1b5ec1ba5eef73a9044549ab3d3f6127439e425bf08e27eb621