Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c80c990250d7a92…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 20:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b00e96f605f81cfb6a6e52f9be1d5b3f SHA-1: 0a7a0fb1c1b126939aaa2b104093407e55488fae SHA-256: 4c80c990250d7a9232ed44dad5dc7d0b52e3f41b4da5e36865dca99db76d5e8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://grupo-kayros.com/userfiles/file/fofivutivedewodixo.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b119548f2c9---sujiv.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134c17b08107---14522368339.pdfIn PDF document text
    • https://lasanisports.com/files/43391336334.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/53f2181dabba72decbb6d923cfd16f01/9880302087.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/kptdt1t4n9sqvbf5v8qjbtshd8/45334821845.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/26163018905.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/22650645226.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56ba0855df---gomerawakisawagar.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/nj1k3uercfkmlkpdv5b3augmgb/61058296988.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/vivefujuwidomo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc60dbae9b---tudetefimivemem.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/166f92f8d863e8ca4d78a378f2f3928e/gaxosewabeleluvowu.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/jowenadivujekol.pdfIn PDF document text
    • http://soon-xin.com/fckupload/file/wewigedujexawido.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1683c1427---livaxunadosinake.pdfIn PDF document text
    • http://flomojapan.com/upload/files/xopazazixusofexos.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/movedupofubepiwalalegu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/060202211218.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092674507fd8---womesuwexexofepifu.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/41459730922.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/f3rac4luiga1jk1d0ue9kfms12/15182915716.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/81043869413.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084851e84a38---32337050306.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b733a91eee751cc35c2786b274daf9c9/86437620337.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/76847665726.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ea0fbdfeb2a192f463186f5dcd3542da/81031784865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pithecanthropus+erectus+mingus+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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 18420 bytes
SHA-256: 6d257ac85de52a0a3c2e49665cb6a5abbd8f9ceb6136d23668b8d726515c5cfe
font_02_sfnt_off000124c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 11120 bytes
SHA-256: 12f4f470b84abb14f0e2fbe9b190a8bcad2e063f9a8f66a169c6a30a2bc29d97

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