Malicious PDF — malware analysis report

Static analysis result for SHA-256 a265c3265e0d26e4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 14:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: af3d03444d6f8fa0999694bf957b573b SHA-1: ec25fd3e607d04b178e770b98982287ece10ab74 SHA-256: a265c3265e0d26e428b9c24b1e7f2485d6229f4166b91ed80c6d458e9b2fc5c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting, 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. While no scripts were directly extracted, the structure and URL patterns are consistent with exploitation techniques that could lead to client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://4wheelchile.cl/admin/uploads/file/77105208621.pdf In PDF document text
    • http://kaupa.cz/userfiles/file/40628131911.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/babagi.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/30138465696.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/9012415391.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/1642063937.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/013c94134ed6baed051546c2cd86f484/39394833143.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/31090033680.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xivomowavenowa.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/potafoxibidutuwupotider.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/9449496217.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/zabakaxurojumorekabagele.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613402ab4b5d8---17567514968.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/14230808447.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_1F011709B18FEDA0.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/ranotirozivugowizovek.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/borufesigukusorojaluw.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/3986061046.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/ruvivepufarewumuj.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/jefik.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e31883722c8ac19d4ba9416cb9e22388/16146923217.pdfIn PDF document text
    • https://rajaunited.com/contents/files/gisada.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a2992cbf32cf14408a863aa0a5dd15d9/71381348024.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/50555182673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pdf+editor+premium+apk+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_off0000d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 18384 bytes
SHA-256: 8897ed11e9406cba4d1cce31eb0217a73d0fa0cb0f7eaa54e2d842914da9b4a4
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10772 bytes
SHA-256: 34bda2db0bb1216e9d1f7adaf59375f75c586cb4b2c6812698be66df8300ee1b
font_02_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1