Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc31bf9e2780d74…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 19:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d39004975acee46579edb3a5841b27a8 SHA-1: 8bef7d859997fc0607e1d6a59e37d175ceb14e14 SHA-256: 4bc31bf9e2780d7460b2da9f09c979cc0043d1a490bdccacf947563dfd27b602
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to phishing or malware distribution pages. The PDF itself does not contain executable scripts, but its structure and embedded URLs strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://chcial.ru/uplcv?utm_term=subject+verb+agreement+worksheet+3rd+grade+pdf PDF link annotation
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83c31316e---xumubezigazap.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/02b5974e4b32ed3207d63e6675b928a6/kujaparotavigugigowokejud.pdfIn PDF document text
    • https://primer-spb.ru/files/files/zuxitapevex.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/bevumuwinukowawar.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/9joe0eqpj1r080c7fg616g22i6/69370794649.pdfIn PDF document text
    • http://licausi.it/userfiles/files/5370652311.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e99251f91---41124777013.pdfIn PDF document text
    • http://canvangdientu.com/images/file/tedatogagibafoniderepaza.pdfIn PDF document text
    • http://agrion.org/upload/fichier/14060745635.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/jukivusamo.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/39796491893.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3a0bdb6b---dazawufaleletoruze.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/69036284688.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/83444994205.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/keneneperudeludo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607981cb6f47b---27756580767.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/morugi.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/jusojewilefolufipa.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/10cdc37a8f9de831e173d046e6e91652/60784209927.pdfIn PDF document text
    • https://visualarchive.bg/files/19385118282.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088254ad7284---86344575770.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/levizagezesiwotajinala.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/86075108621.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_off0000cd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 17632 bytes
SHA-256: 6d08c658fdc4e480c8594df6423a3015bccfe6d738d1f124dfdaed8d0cfbef4e
font_01_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 11792 bytes
SHA-256: dd0ea3cecdb7bb4dfbf55f44f8aa2b0e6300a1fca7a3b172636ce31ea5509039

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