Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbeaf9c623158e0e…

MALICIOUS

PDF

91.2 KB Created: 2021-09-04 01:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fae8ed08c1f6c1498924b7e2a9fc932 SHA-1: 3a8dd510444fde55793d18ebde771316138307cc SHA-256: dbeaf9c623158e0eb0929d0fa6742a5f988fd08118c7f4ad11c5ed55211364fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to external URLs, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03cb1c87f---vovuxosiredelafojuvaw.pdf In PDF document text
    • http://sprinter-lab.ru/content/File/51028358796.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/latitozi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5359a986a4928e26b7ce80f3c6af3f87/folataponako.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7db5d0c7be16e203dc77e794644182cc/xubirepiw.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/naladoxozunak.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/d8b07d94be8af21e693c53e81c6cd7f0/45388847192.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/wotejepoviworeviko.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a3e52f4aaffcd94f5458eeef8faadbf8/judumidujimos.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ca06488c4e---49460440170.pdfIn PDF document text
    • http://renknh.com/ckupload/files/25187217202.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/rodinu.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/ruzit.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7el38p0fbvtes17e7fn3ldrjv1/savovizavomalapexojiko.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3cd1351b28288419ad21e6b92c8f87e6/90392277576.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a00160354ce3bf45f7736de3ca2ad87b/lelakozatopadifuj.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/9522184945.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc2b3a3745---16384626717.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/47633069958.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/23597891978.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/tugewazumunufopusa.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/45364638660.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/34314633385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=social+research+methodology+a+critical+introduction+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_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 18324 bytes
SHA-256: 079e6029c103246cc2a107fd73863ccb07cf5e59c74651b924cf639a778beb92
font_01_sfnt_off00012b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B30 11356 bytes
SHA-256: b14f6161343f5f0e29a33be0eebfc91875330ec96c30d7a9625ce8af75421f8f
font_02_sfnt_off00014589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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