Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d233ac4e0901dff…

MALICIOUS

PDF

80.7 KB Created: 2021-06-18 01:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a86a94c68166a2c40c44463c3a9f4e7b SHA-1: c0643d10cbd7d5bff0beacb445835021b93355f8 SHA-256: 3d233ac4e0901dff8fc049571bc96c08dec6b2d966349fd20188ea837a928f13
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded content, though obfuscated, appears to be metadata related to the file's creation and potentially search terms, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=gta+5+how+to+sell+bunker PDF link annotation
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d928ac2cdb---sobepu.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/lakifudepoworalijajaza.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/tidovogejalep.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bmjl5l5uv1r9ipjul628l1d647/dopemafexifiwefege.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/o3od1286kej3g82tr4c6ai39p1/40689356628.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/99eb10a9be64671122152206133058a9/71275414451.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f1e7bdea8a431fb9826ea94b24fdaabd/75991597968.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/1079191162.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/goboragorovabaregovume.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1fe8aad2---mivuzutizuroxu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/82688756354.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/17208784448.pdfIn PDF document text
    • https://congchung7.com/upload/file/34028450390.pdfIn PDF document text
    • https://proxus.nl/file/17860978193.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed5fe5d875---10479360139.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1401f4b7bcda8b4715d2cf525931ee6e/rupigavabodufupazofado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 5224 bytes
SHA-256: 95938f60fe208c0dd8bbb8d463924903d54427f41c456f878582c0de3c2b2b3d
font_01_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 11140 bytes
SHA-256: 41422c40cc93d887c2c1e81731233c580cce0d7880dfb312c87daff2cd2163ab