Malicious PDF — malware analysis report

Static analysis result for SHA-256 d939739c7e23ea6b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 15:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1541cb74117c0aa906a7bcebea8c75ce SHA-1: 029ae3714130814d27a929f005df26be0a161574 SHA-256: d939739c7e23ea6b937a5f4338cdb161dc87de108f3b050dacfc4beef459b04e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/2f27f87c2cd6d4aec3ce834bf3a2cd16/59115282063.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/zamiwitinaxi.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/ef1c99224eadb49aa4ebc932b79d6427/53708611972.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/799719b02de0b62b30288c3ee076bead/73716921477.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9cdff54328f18a61ceb70770dd2038f6/vuxebejopapalopojiw.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/zexobesapa.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1483b969f9---mamakew.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/senamowukox.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0cf40bf8328a1c7effb2e1eb850e93be/xofuxawolezila.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/gukotodutopijerepefu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rpkskkl4afiq2cpbd6g9jvgat0/duwujobebetili.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/wududofirezuresitalo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09e2b57176---jagadis.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b707d92f2---26172733070.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/gosiwotifutopasibulev.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/43155023883.pdfIn PDF document text
    • http://emeat.ru/var/files/68249217791.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/teradaxaxo.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/mexidopugozanamiwigiwopef.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bgok1q88qou7qkf8u0vlf6j872/58152123865.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mdv23t77rmsahihqpv7ek66npm/jorojibebameloke.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a654ba9fb3b---roguragefaz.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/pitevenikofadebigu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161009654afe30---vidutelujeze.pdfIn PDF document text
    • http://wohingltd.com/userfiles/nilaxonikitufedozixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+visitor+unblockedPDF 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_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 10668 bytes
SHA-256: d8451aaede5811cb80e63b8a0d9e77637008938382d24c7f13fcd8d87d22422d
font_02_sfnt_off00012009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 18680 bytes
SHA-256: ea7987a00a01b1d73aa5a78f55551ca3bd6fd49aed4562d19e22c9ab7cbb22b5