Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a5d9bd0d6f613b…

MALICIOUS

PDF

77.2 KB Created: 2021-08-07 22:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0dccaed3a14a0cc2c6ac2f83e3459575 SHA-1: 0e7654378ba9a8dd7bbd8444a84ceed12c868674 SHA-256: c2a5d9bd0d6f613bfc24c8ee6dbe495692840c9983c9ff8ff66621418795715a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd80d547d1e---97775379029.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092822d22236---14446365424.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/niverilifetakab.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/wekeriluxezo.pdfIn PDF document text
    • http://agro-partner.com/Image/files/nipewerukemezefodomog.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/58327348778.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef73b308cb---48582615809.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/pafuwusufikeligesapimis.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/xuvafokobom.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/52172838282.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f525c6cd49---sepumokufe.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/bs35u15mo9vcims07h6f8jddt6/37539895235.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/kixut.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/333fda9840c6a56c560d897f95cd6fc3/49287619070.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a51d7991c---lededavaserejuvami.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/limezejomajaledevas.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/93848867544.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/52325771312.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/mukebejiron.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/66926749826.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e5e418a5---kukuzibapifozan.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d02862f25dc---paretapufirozadititaziwez.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/20327708799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pyar+jhukta+nahin+hindi+movie+songs+free+downloadPDF 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_off0000c461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC461 16888 bytes
SHA-256: d255ed8e90aead712658ca2c2394ac03279030e8145d60794c23095ccac82f65
font_01_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 11388 bytes
SHA-256: ada8136695f9fc9cec1046a92945a2a6f2c66df99313a7f05957fb942dfac988
font_02_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1