Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d5593c23eeeeba…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 15:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 75347021d714c25a325d9ed5742effa0 SHA-1: f2624576711e8b187d29eaf0619afc4ee89d1152 SHA-256: 40d5593c23eeeebade2c41e1af77ef0e563f0a8fd16c890810cf562a3d33c5f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the presence of multiple external links and the high confidence detection point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://irlanc.ru/uplcv?utm_term=film+well+dominated+love PDF link annotation
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4fd21a57350397893f4f7126eba20009/topejanodoloj.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/74b8091413ab2b989c053e616b5a713b/51956471200.pdfIn PDF document text
    • http://deauville.ru/files/file/vufitukadovadeberogux.pdfIn PDF document text
    • https://t2sc.me/userfiles/5562752353.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/u41nht3ton0rgihurdeoo7s7kf/kibaroxu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098550c40594---luxowiw.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a50585d5882e8674861a544cb8dbe8ce/jaxitutudiwipin.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/40727025731.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccb8e13c07---78479065084.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/90244201721.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/lagaxumax.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/02160808f1d7a9b8725971f418633cf5/xavuxopovapuxiguvataworu.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/xorafaromokirunaxedalexe.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d9539c847b01d3c98088a104fb465ce7/vaselujibodamumala.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/lanavojesapijonibonemiz.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74abc49bf---32356188896.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/98406905839.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc92b07b3f---76122037961.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3894ba5c80---90564495956.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abeb7ec5d4e---nazejopumapabu.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/mexevawu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/kjg6g1fccpj6s46hdmh39p81n1/sufagadipego.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/flku5dsd81vd0t2a7dpla1lv1t/vujavagagivewom.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/btdogrj6780um69frae2tpbukq/wulawubafox.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 2232 bytes
SHA-256: 3c1fd90b65a2ee3898a756d6beb422e99e2b37ed9ddc83c5b41a0058f05d7781
font_02_sfnt_off0001187d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 17788 bytes
SHA-256: c38e36d55f8c497f25a6f7ee84e1b56d06be126a5a87585f6d6ad51ba9e2ba39
font_03_sfnt_off00014676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14676 10272 bytes
SHA-256: 25bde27e8847737f36896ed8429682beb979a8070101e1367e7436a2413f971c

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