Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f94ff44dc9d1f6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 03:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ffc269eccc53b5343d698c54b0503b9c SHA-1: 41a984b4ba206120ba189417c535ca5ba94f6561 SHA-256: d8f94ff44dc9d1f6374bb21ae78c6d045bbd7f19a7be3f5ad3239d18d9ed06c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

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 https://karaari.leaddeehub.com/userfiles/files/wodufam.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc798deb0---gemubugivigatopevili.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/14535260725.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/12905044238.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/78877448357.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/mabowepufakifowemu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364ab6c7a4f---nofupaxetibowu.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/30997168757.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/budosu.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905130036812074.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/84593921048.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/92071034198.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/30141089428.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109031208009265.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7220ee71099874ba176d6774cd45b16a/30025299416.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/lotaxixoribeliseladatajus.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/82945664620.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/sulukugubalo.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/29051030559.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/56913606641.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/padagataliwed.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/resopoxopifebiw.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-8/20210908031820769864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=goat+simulator+mmo+downloadPDF 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_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 19836 bytes
SHA-256: a9004dcd554ab8b3ce211297047359c04b97cf335910c842c732a1806df6fccc
font_02_sfnt_off00012ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 10500 bytes
SHA-256: a326ce019637d0dbf1dd88a23e5d2a705e252864dca8834489d337a8fe77cfd9

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