Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc19133fb4f2de7…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 00:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2040e44a661bec9c1a68b05dcf410a6 SHA-1: 83ff4e52a66aece8860c9940eb680128a01f10c0 SHA-256: 8fc19133fb4f2de75f8778cde78f9a1e4dc9fdc3f32ef1943712689da6c20c79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://oolong-dining-co.com/webroot/editor-uploads/files/56034279627.pdf In PDF document text
    • https://bokaichenyu.com/upload/files/zawibafojipiximuxama.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/jotudogefojalomowidi.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/64715664336.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/xufejebejada.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/452587ee0c3b7aa2541259102639afd2/noboxi.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/49757491711.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/refifotuzepomiluge.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5a9558a3---besel.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f1d2610bf9f84675be8c3e5b52d99e9d/50307821762.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/jisamigurulox.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/5107401200.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/59100998175.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zafafibo.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/gabodasejejujesifin.pdfIn PDF document text
    • http://steinemann-ag.ru/wuxexakas.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/sedirixevatirizokineza.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/golutasivaka.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/zowamuvimupumowide.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/nurobewevuroxuwaz.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/fewimosisewutomil.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/19520877682.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tuvebidimoxitemebo.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210908180014813.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/58328575841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cloud+tv+app+for+android+boxPDF 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_off0000ce59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE59 17896 bytes
SHA-256: 9a0f4d2cc09d22337187d7682654d4d285563238ad12c834ffb3cadd22e5d79f
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 10628 bytes
SHA-256: 96139b6e0751065d54383b6c2ce05abf4ad45252a7b9234879f1ed8457489422
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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