Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cce8b731058d81…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 18:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 884955a08e34207ba9c1b33dd46a246a SHA-1: 8b9fcf03fbb33bd039da2422d218dd38af136e8f SHA-256: 98cce8b731058d815cb2448f92b5aa931443aa05c8d7b03798ddb3ba5ea216e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of external URIs and the heuristic firings point to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=match+3+building+games PDF link annotation
    • https://jpjplumbingandheating.com/FCKeditor/file/jumetolujijofapub.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2e17d9296d8400d6ed5e62a4506cc92a/lubuvagalenibomulibazevef.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/96125390774.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/91585839779.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/mixunu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e0397d21---zolasomajuxego.pdfIn PDF document text
    • http://lj-group.cn/upload/files/zivimetulejumafaxap.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c750328eac---desatitesizabewojijozifo.pdfIn PDF document text
    • http://czminghe.com/upload/files/pupikebifexorisoba.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/wuledabumop.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/fevuwideradoruvefokasilo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/54d71654f827525be679de0d5d3a07a5/delabaxaba.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/39314266897.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/95180074411.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109081311184403.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16135d72ef1476---86112428299.pdfIn PDF document text
    • http://fkhd.cz/data/img/dujojumunemunafiwefokexe.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/30588719497.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/hi3aff4khbu94kpb6ng266knq3/15199102874.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/665e9d6751340e4e2ff44eef63222be8/zegudosisa.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/23940020822.pdfIn PDF document text
    • https://esvigo.com/upload/files/zofogokulebebulubafox.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/677695853.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/zatinijobizo.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/bigezopawaxumunuriw.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/11/kazula.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_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 11004 bytes
SHA-256: 42c7a8cc76c96bcdb2604149922894ece1d652de891dce8c39346b2c891886bb
font_02_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 17792 bytes
SHA-256: 2d3fef5ad2d6329fbdaef8a03905f248c20a12638f1c99382909c79669123653

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