Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4346214d65fc78…

MALICIOUS

PDF

71.4 KB Created: 2021-06-23 16:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0d542b8cd3c03aa2bcfd24abfbf84fa1 SHA-1: 9e80f92a2bbb1b95e8f7a0665997368f0483c969 SHA-256: 1c4346214d65fc78b56f5174d959cd36075a0ff32c6404ca98c3cd04e645405c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though obfuscated, contains references to 'song download mp3 ringtone', aligning with a lure for potentially unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cnpair.com/userfiles/file/wozesufuwivifewodolu.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65c45f161---fivorasegunimedapavaxawud.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hp31ja8iej2jhffnr41aoa6h8i/xupasakupo.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/lulub.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160943eeeed6aa---tasidovaxegelatakapifawud.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/32619239987.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725623c08ba---kazusutamij.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abb3cc2dea6---12891468657.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/cch12m3hq5smerpncvk6p951r7/70340319000.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc7e78ec8b---59132365621.pdfIn PDF document text
    • https://avvocatoboretti.it/file/66743863276.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d9e67f8a89a2f057fd1dcbbd08fa2e18/kuzejaz.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac8ac4dd59---74117664763.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffd556f0bd---92805887095.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/6c129e39e627c8388db3e29036842ad1/setukop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=inkem+inkem+song+download+mp3+ringtonePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 5536 bytes
SHA-256: 84d160841eafb5772a4f589b7706af47d5226af17b89a8dfdeb00c3c3b09e9dd
font_01_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 10864 bytes
SHA-256: 860ddcf8cb272b88e263e60ae4d4b97984c916fa54139efa73c297f8ef84bd28