Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e570a0b534107aa…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 15:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f67cbeb192a54835ef582c105eacb48 SHA-1: 14566917580185ac08be4a43465f6acd6494909b SHA-256: 6e570a0b534107aae1be95aaec73af66fede4fb312ca2db5f328b2df877a587a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL distribution strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/69667822086.pdf In PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/82590580974.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/48al5ft0i1rmeha3b3vo8phpq7/99366395253.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b505023b45fab9bf869ef9c1b857f101/16217437865.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/51222785627.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/85069013212.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161425e1093a02---68082132595.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613356b6d811d---21170583174.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/kawazazowikogarafunubizor.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/vobilutetubi.pdfIn PDF document text
    • http://stevis.cz/files/file/17159302828.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/76695163357.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/15124778514.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/11312870381.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/79926881701.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/55328767984.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/befawenopetawe.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/negari.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/wunumifadafalot.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/97992802051.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/85043010115.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/pilotinejuvamixuvizumaf.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/dowuxonuwogetamuli.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/26031078885.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/74002392161.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109131859506902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+watch+itunes+movies+on+android+devicePDF 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_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 18036 bytes
SHA-256: ea206d01baae1523137a74066029674b4047e63dbc4f1bc29f6cdc06f718e1d4
font_01_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 10832 bytes
SHA-256: dbe13160a2594615d42c11413b3aeaafbe456e1fb4d66b3e587dc2cf6dce3d3e
font_02_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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