Malicious PDF — malware analysis report

Static analysis result for SHA-256 d106dda4b2ba7553…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 18:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f54e2acacbf74f1ac317faac2e57958f SHA-1: fa11ff7d5ecd922664be5cb183080e1380d47109 SHA-256: d106dda4b2ba755368e09cd8413ed6e99c08844d008b0b137d93b7fefe01ab01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, including one identified as a compromised CMS upload, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cnpair.com/userfiles/file/dejurip.pdf In PDF document text
    • http://visit-pune.com/userfiles/file/7253248476.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/lusabopawanuvuvogijofan.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/76814998295.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb3842a52---rijelemedinisigum.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7c355bc411e89884a489484ac38e8f77/tosanowapulusumaniviv.pdfIn PDF document text
    • https://priscar.com/documents/files/jesafenexav.pdfIn PDF document text
    • https://binhvi.com/upload/files/28647188782.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/7384726932.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/24934937251.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/39386482882.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/27799946807.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kamevovawopo.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bb5ac0be9404fecfe6cb8f437238fa85/navudinu.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/12891689788.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/pupuxufojulikasiga.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/60510087616.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/pabuzekalefomej.pdfIn PDF document text
    • http://scantech3d.com/files/zobepidegudetudado.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/99908767671.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/67919556295.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/junetoribawazigutafawef.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/97030635826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+change+video+to+mp3+on+iphonePDF 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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 18328 bytes
SHA-256: 34067ca80acec74560eac34f5c22188b5c46ccf0326b261e5d746f7fd9d69350
font_01_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 10964 bytes
SHA-256: c1ccbb9383b82637991716324ea2eb9538c9cf8fe887232eb0eb5d300983dbcc

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