Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5074039a0a5303…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 23:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 342c94c02baccba2f6427d01a507bb68 SHA-1: c9893cd46b50c9809acb97c9edfd3c325fd305b6 SHA-256: df5074039a0a530303727bb6956d75d6e99bed3ca16db8b70be44764e674760e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with several URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/64873758641.pdf In PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c8457d47019a141c0d44ec31ecff3ad8/81950423762.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5fd8482f---67015326965.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/fusuzitew.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/pugikolodiz.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/gorulufokolif.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/musexadetuvanafo.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/bitepoxubasiripaxovilapo.pdfIn PDF document text
    • https://ever-progress.com/upload/files/fetawapadajeligalimozus.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913044717548841.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/nuzezijoxoriludosadiri.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/66949201119.pdfIn PDF document text
    • http://bulmarconsult.com/files/welivaxukajaxek.pdfIn PDF document text
    • http://alcantara.cz/data/file/kaxenofedobonoxuzuge.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/nemaragujugoxavavepumisij.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/42175131933.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/kagaxuxavisevulo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb2d30b7f---lofusimujifojosepaligesop.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/melefigepit.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/walajede.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/69157157462.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/katomit.pdfIn PDF document text
    • http://a-pluset.com/userfiles/5674595472.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/9635267153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+warrior+monk+philosophy+pdfPDF 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_off0000cf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 17064 bytes
SHA-256: b01cf7c98cb28e2e89eccc92ebbd79762597251531fb3768f8162dbf36fc47b4
font_01_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 10920 bytes
SHA-256: 95cb4b88ed88b8fadb2d54fa852034ad7c61d06bcfcf959be65a0a87fbc9268c
font_02_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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