Malicious PDF — malware analysis report

Static analysis result for SHA-256 f538e379aa913a71…

MALICIOUS

PDF

68.6 KB Created: 2021-06-06 16:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e5b25f9a726cc0480698bbfbf083d59c SHA-1: 80b3e636d5cd0c705559f90e3f16b997f2d45a3f SHA-256: f538e379aa913a7122bc9a33974cdecce6c6cda311302b0cfedc107ca39ad187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of the ClamAV detection 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further indicate malicious intent. The document body text, though garbled, contains keywords related to downloads, reinforcing the lure.

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://crysiq.ru/uplcv?utm_term=maruvathur+om+sakthi+song+download+tamil PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/52514464fc7d6b678b5fa07fbbfb688a/rodiviwegogurorelot.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087474a326f9---34542347513.pdfIn PDF document text
    • http://aps-mes.com/files/file/85616267801.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/14556162091.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8342f511b154c8b8b26ffad35e6e99ed/xilaxeranatotef.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/11b3385e9c9596602140003c6eeb9f6e/97163890811.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a837ad62329---9749309826.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/fedadomoxopal.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160838dcdee730---sanazamu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/eperetuwetanikobetulome.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075161b86397---68836183669.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/15017161203.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3fb980075---20985646692.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/036mtf3q97jieunvnnomlkc9o9/zimipavutefupebotep.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/zagawomivupubarusanimep.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_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 5460 bytes
SHA-256: 414e3d3dd14af5989e5a115bbb5e2cfe4c14c2716b6d2154f467ecd8113c50d6
font_01_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 10392 bytes
SHA-256: 5ebf56399719c4a3bb6abf4d72464eaa350ae348045add99e159271eda84cb11

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