Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3bfcc6d22e61a8…

MALICIOUS

PDF

76.8 KB Created: 2021-08-30 21:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f633a97ae7c0b13ed08fcca56978c30 SHA-1: 48e8d14376f179209a9803ec7df3ef5d815d4932 SHA-256: 8d3bfcc6d22e61a8da86f07df7cc46c5f1f1ab7761d05d660fe9031fb43e4586
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while numerous, do not contain exploitable content themselves but serve as entry points for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hyundaihungthinh.com/uploads/images/files/rufimejedujejopum.pdf In PDF document text
    • http://elsekmont.eu/userfiles/file/funasazodafade.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/44062551003.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/52923607553.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b890849c6951342071ba739370b2fb50/modoxavipona.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d5a3ec31---lamil.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/jezafawuxukesejamefitefu.pdfIn PDF document text
    • http://liyangah.com/Upload/file/pemuf.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/20391803796.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/ropuw.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/71286592306.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/768b8036fcd06e2d2080b8154a16563b/38399556666.pdfIn PDF document text
    • http://vinmexindia.com/uploads/86803773072.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4fbbb004---pizowumipobeb.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/65307648518.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/7ae0c0a8d0f2d438f3ee849875820689/28105704405.pdfIn PDF document text
    • http://tyextractor.com/d/files/bexebaxefolojimelavar.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6788e978ffe41f730464d75cd8d9c696/nekiderusodi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776cf75a7ec---mejefenidegevoxenaposubu.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/22362195978.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7b6dab19bc1e9fb1aa2baf2ddef1248e/fazofavakura.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/h77nirn3o2v1f68hsbkcqg7q2l/lumagesidelofujulaza.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/misunosedaxuzitexin.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/werejamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=polio+endemic+countriesPDF 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_off0000c8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D5 16996 bytes
SHA-256: 2f61322a51ff7eca886f9cba966a3afb1b8c1c02e24b6549b67701f7394236b7
font_01_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 10468 bytes
SHA-256: 984d67dd210f924fdb36d98f33fe733a6425f5d800a94b63801c3d841c53fdb8