Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa174be3971671a9…

MALICIOUS

PDF

73.6 KB Created: 2021-09-16 17:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f490bb844512a61457903a0d29ccbc7f SHA-1: 14d413a7da82b005b08891e8d6f5038ba512a425 SHA-256: aa174be3971671a9bd05585941e35f5ed6e711e74fa0db152a2109ebadd4ec39
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are presented as tracking links to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://beijingteye.com/upload/files/jafaminubolero.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614306d4eb33b---pudiwigo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66d25a818---6152420958.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/35698674997.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/41088892136.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/4294365398.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/kiligabelifemidadojitu.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/nitawozudizuvowevuwo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5517ed4175444a33db242651ed81b960/gowifo.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/zupozefomavetakozamesi.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/libik.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/20984035920.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/nufoworofe.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zalome.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109022302028796.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/63596072823.pdfIn PDF document text
    • https://wrd13.com/force/file/darizetome.pdfIn PDF document text
    • http://ausafe.net/images/art/files/wojibodojedapotu.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/90465856286.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/xafiwokakenubufaja.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/guxivuzefuserinaw.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9f2e4f46---didepexudusezizozuzo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614321501a4ef---dixete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=speed+post+tracking+domestic+indiaPDF 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_off0000bb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB00 10976 bytes
SHA-256: a862fe2ad632f2200e1fd95e11bb7b980713c2ccdd12cf12233e6fb4b1d171ee
font_01_sfnt_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 16980 bytes
SHA-256: 3bee899d67000b12dbea8973b545c77295ffd1a82c8d2755d4a3d6c1a72214a5
font_02_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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