Malicious PDF — malware analysis report

Static analysis result for SHA-256 28203cd602797e4a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 17:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d9ace3087ce7ac3b333b41e6d247141 SHA-1: 67dafb6a41bdd56a1b711b130c440e846fd147d9 SHA-256: 28203cd602797e4a018b6c7be0eabcbbd5e1d99ffc56fd60290d06bd22ab093f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, pointing to multiple websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious or compromised sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8fece229aae896084e2cf083ebf0f961/gofeziti.pdf In PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af668c7ce2d---tarekivebitegerane.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/11031978813.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/sikilonudidivepobexadix.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/3287125269.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/kaxedepimulu.pdfIn PDF document text
    • http://sdds.be/userfiles/file/zugapuvuvodazolubi.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/wetumovuro.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/24147241255.pdfIn PDF document text
    • https://orrizon.ru/images/file/68032742709.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a9c629f6---11034628856.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ne79vq8ths1mheelpej03v1dap/13802797124.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/vazagubewatipeniruweradul.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/48260708322.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e734655e5---31596300352.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8341b5456---wunawunoxojibotet.pdfIn PDF document text
    • http://prosquash.by/data/romabutilud.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/17371314094.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/tebomuxetigowikakawugamuk.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/fivovusulatan.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/zezudetiwojufepawi.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/xufiwuralezufudibope.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/kulebudurel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=social+network+analysis+applications+pdfPDF 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_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 10980 bytes
SHA-256: 95972920f63029199786290a2f0950cf714005a60596b61f547d49908477951f
font_02_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 17192 bytes
SHA-256: 99a38dbdac66ada992874817eed1b0b2ec0da634a5d5403eb536015c1ca54f4a