Malicious PDF — malware analysis report

Static analysis result for SHA-256 450dcb4c1fc3d720…

MALICIOUS

PDF

96.0 KB Created: 2021-09-08 06:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 402dab2bb9123137bbed0cab809de717 SHA-1: 0f5a7438585bf14d61c0bf93521130d729023b4d SHA-256: 450dcb4c1fc3d72018690dbb8cd6db10c4c7ac6ae5a325fe3d16314073b400a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The file also hosts a large number of links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laptopplus.be/app/webroot/files/userfiles/files/tiruvugifiweve.pdf In PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/iimukuelmnsncjft40g8vq6i82/24370041764.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3455525363---53662377749.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/78369786012.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4abd65b41dafb369c39d3ee0885a7ad5/68270865494.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/jepewufurozinerofipepire.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/fijapedemaweb.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/13052317083.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7b96cc55---6222595425.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/54001887200.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/wumevof.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/88f3247fa2c192279e91da0b1657f7e9/rofoxuwuxuzutidolokusulow.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/tufura.pdfIn PDF document text
    • http://hbaoge.com/upload/files/nepowilawukusoga.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210715162109_5kffcl.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/31416538491.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/fagifedofodopavi.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/fumukebepu.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/72908583083.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pnahqf2d1mbsbfseredeff96qn/nogivon.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a029e03781e---3428107171.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092041ed316c---wexebuwetemiwog.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c2e711363---wawemerododaxavad.pdfIn PDF document text
    • http://areaarchitetti.com/userfiles/files/70956426069.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/30663183173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=duke+basketball+offense+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_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 10632 bytes
SHA-256: 2359fca081838bdc0df7922fa0ca2fa3224fa13a7f641dcef066fab49a4cc6e9
font_02_sfnt_off0001440c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440C 17912 bytes
SHA-256: 7586f92b3781e38060f6490441ba744cb4ce7b147347dddea50de787d3f43cf2

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