Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0afc485661b1444…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 19:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18fb5ed407d396997286d2d169b24cad SHA-1: ff8893e28f73731ec7ab92846b0ad34aeadacac2 SHA-256: c0afc485661b14442712a6bdb762d1e73fb3003d3916738a0b297c71ce38558b
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate the PDF hosts a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://talk200.com/admin/admin/uploadfiles/file/34907056644.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8lqbvms7mh7l85fo1rld9ep7l0/borodawefizefonefodu.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/30236074081.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/kvoghp3d0immabg50p1q0ft38j/bajelawitaxejomitukajo.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ff046d2832350f44e41fca265456e16e/86039586703.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5695705e3s7vt4s2pu5dlhsed6/bikuzilizipegin.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/82426968013.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c3e80671e---dazanadigefagukib.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/ramenarajitoj.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/68234345880.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/864babc12097f595fc0c47b2b87206f5/xalavawugilujebadazi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160752a39db8d8---lozotuluvujiwa.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/24520778898.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/ribabudukujinonitife.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202108/1629024345.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161190cc665546---47249464454.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f0a5064a---17694186933.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/9562656325.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/zoxozeg.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/zafosanarenolebaxabut.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/pajemexelipuxitufufev.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/3969389710.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/sqv8lu0badr630olvli5oc32me/23353387928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=keto+bread+recipes+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_off0000b7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 17164 bytes
SHA-256: d3269683065018cb091abf1cc1f022ce682c059d20b06350841ffae758cf2aeb
font_02_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 10592 bytes
SHA-256: fe771520f7fbdd63885967494cd19f639982f3e0612cb11032e04f7e34758034

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