Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6ea593b86a774b…

MALICIOUS

PDF

77.5 KB Created: 2021-06-27 23:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 225044512494e0555a6f41f414dc5709 SHA-1: 57a0dc13b9e9de2567a01222ff691df8a5531e04 SHA-256: ef6ea593b86a774b9f0aa360eb3eccf350e8494037598f020f4f387f27510636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=functions+and+relations+graphing+using+a+table+of+values+answer+key PDF link annotation
    • http://www.moyekolodin.com/files/1155117212.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xulanesusuz.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b072550ef89---pajasago.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/69033962820.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/mizarodekixiwemudosuxu.pdfIn PDF document text
    • http://allycatering.com/userfiles/gilonemabawixi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f39875ed7a---35846542546.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5e151468d---vabuxuwak.pdfIn PDF document text
    • https://stopserv.ru/files/file/baludu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd5fa6b9c---74724880281.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee846b7fa---diliruguxuzopogadozig.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b3d07273c69036b3cae23861278493fc/tuliduguxugatazok.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/ledijaxupobonef.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/figokanoxuwipeb.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b171dec48cc.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/81083820782.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/86dbcbbdf208b4e3ec72db816cce4f72/23211173844.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607098e1acb31---geres.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1267ede507---bunopowepisebukile.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/34348412531.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e483b35d46---vezujafobapomixetugowifad.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xolaworu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f161d819a---1789228275.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3195a09465aa2b9a8ce2a2ed444d3bea/duvazakibojefibozefepebi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90D 16208 bytes
SHA-256: f4f5b38ec7e59304e9b96a8add13fc23ff4ffe910211a3f6ec9e10e15180edcb
font_01_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 11476 bytes
SHA-256: db9577f5f8c2ba26766e57f323c538aa7aaed3729a0a84bfa5da1d0106a62d74

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