Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df9c96c845bd9f2…

MALICIOUS

PDF

82.8 KB Created: 2021-08-23 17:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0544533883212227b26dc2278d980746 SHA-1: c843a22da146b670fa8d8ff28eff1818823b4ecb SHA-256: 0df9c96c845bd9f22696415d7b9af2882e9ad5663ac3ebfae25d9024213fcae5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The primary attack pattern involves directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/35433359272.pdf In PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2461c6ba67d7e85d9750d4189cb4c773/xiwugugepedidezu.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/59544155134.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/tuzagebutazuduzerinefabaw.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7aecc91f---56384525842.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/68902232703.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/wojina.pdfIn PDF document text
    • http://myqself.com/upload/files/momebokutijoti.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/47972917660.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/17169917133.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/ditenajune.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210820141527807931.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/2944034529.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/5324fcd77ae5af3ba7c7e32d40209168/bigiten.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/58078043985.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b31e5ea60261ce2b814dc4b6eeae72ff/xilejipolopunodako.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/35202636177.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/jogigudo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086811f117fd---mepogugodoxid.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160838319b2b9d---defogogez.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/l48hu89fsr56vn70i77cnc4hr6/rabafigigafivikudulajoma.pdfIn PDF document text
    • http://charontrade.hu/data/file/16407394023.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad269a29c56---87569320994.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/dd853534b5c7a8fdfae9517390176b06/83316610053.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/zobexigenavekuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=if+we+lay+herePDF 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_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 9880 bytes
SHA-256: d328e4c4c86abd1d346c7bb7c5c37c2c77fc3a2a65c95f96e9ddaa26ad79edcf
font_02_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 17104 bytes
SHA-256: 87801eae39db4fe109cdc62e0d2a1a41e5b3b327fee2f68376a3924b487c832a