Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23daee23bcdfa94…

MALICIOUS

PDF

94.2 KB Created: 2021-08-13 19:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 759b2ef3796c71f75848548cc4570fbf SHA-1: eeda85ad28c867b1e668100fab65ddaf449df302 SHA-256: f23daee23bcdfa94ecac2ccddc2f9b19afb727596ab1e6dbbd80ff95989dff8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the nature of the links and the ML classification point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=charlie+et+la+chocolaterie+fiche+de+lecture+cm2 PDF link annotation
    • https://agrilaui.com/userfiles/file/xozuvilij.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/notebiter.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/nebejiwikupaje.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/613d236c192355b7bf34dc058e9a0ef2/82607613033.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/35o6ch8b6rm69gvmd9jvdj6530/kiwitekasujutufibalu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2053b8b35---71902060739.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/88667569846.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/27277486451.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/murerenolefakigevixabafe.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3d124058d1c9b3370d5133245643aa0f/16648900099.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/50643378376cb41c4d5b46ea3fafe748/numebufezekorufigometu.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f3c03fb63b1bed53fefe532d1e33da03/ruxovagupajelademupete.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c795b8b51af---vulutapuniv.pdfIn PDF document text
    • http://chikatere.com/Upload/files/59821037677.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4813a1919928a411630eec1826920e73/76382384599.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/68237333cee8673b782dca55c8863a8a/basivena.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107171041489467.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/89475320190.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f37755853---talelidebaninewunelo.pdfIn PDF document text
    • https://pcetravel.com/files/file/95174601620.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hpla2jf5m086i7peibod0j3bve/70573168144.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d9ab09edd5eccf7cf099c63e6795c08f/firoxat.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/350a96ddd91e580b9cf860d8f23fabe7/xonaxejebilitiba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 10720 bytes
SHA-256: 5e75d5d8bdeb4aab9d89b2f017f37a6ef04e8e4cd408ec7131ed63c84be2fd73
font_01_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 19648 bytes
SHA-256: cdf591e01d2ec953af07173a08b0b1d1a8cdfb26cec46948c680bba0626ed9af
font_02_sfnt_off0001505c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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