Malicious PDF — malware analysis report

Static analysis result for SHA-256 989094538e267d3b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 02:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f739281240c8a3e1e43781ec025c757b SHA-1: 196b86ffefca6b988a14d1621becc7a3b1256aee SHA-256: 989094538e267d3b8bbf5b0adb06f90cf029024ae3be29c380331e60ddfdf61f
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised websites, many of which are hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=droid+turbo+2+sim+card+slot PDF link annotation
    • https://minlinart.com/archive/upload/files/13993407511.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4c9d94c8a8317b793389ee1315be08b4/19587824674.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/nobazipelebafedoxiraga.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/jajekajelagoniwanuxowosar.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03926155e---nojupep.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/32346976734.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/53475445538.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210908221729779206kljzxey4msau.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/bizujuseb.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/19511540150.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/majikofonopelodezadupu.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630839216.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/vurozugo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ecf081ec82423d34883e0cb63e0dfd2c/48549673778.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/wugenujivuzawarotagolol.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/46843683885.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/mukezolizukilu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2e9c1cfc---22520657845.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/94178430125.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161373bddcc8b8---vikebiburemevove.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/74960306175.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd531d323---94664952142.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/nixerotal.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/rugume.pdfIn PDF document text
    • 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_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 10656 bytes
SHA-256: 8a1f37497b3f56614773d96ff83421e9c7761a10c04c5a7ff7cd5b21a6f7aad8
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 18084 bytes
SHA-256: 0d31fc813ca5d5d5829cf314c398427dbb450eba8440499bcb6e13966bc765d8

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