Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5352876af31519d…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 11:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2375465c6b016fa83f541ea9aa23bb33 SHA-1: 06544f2ddb13483a4bfde2ba7ee81db192169003 SHA-256: a5352876af31519d73afc232f8ba9dd943c8fccabb7e6c1ec4c6803d3c722457
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The presence of embedded URLs, despite one being marked benign, suggests an attempt to redirect users to malicious sites. The wkhtmltopdf authoring application and PDF structure are consistent with documents used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://karatenarrewarren.com.au/ckfinder/userfiles/files/nijewekosajixigedazeni.pdf In PDF document text
    • https://keyword-lda.pt/site/upload/file/67103538703.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ab3014405---23597560101.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/paluxelusibufe.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdbf1cd80---28417196217.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/93390002539.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/jenitetumigapoja.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16127527ca9ac5---8265132527.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/73833622868.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a52141ba021---64409356695.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/kovukarijaxe.pdfIn PDF document text
    • https://asken.as/bilder/file/rifedodisunamuvezokuw.pdfIn PDF document text
    • http://effektfilm.de/files/file/31870354465.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ab0ac9d8---konosofesiruja.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/wasuzi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/s8k9nk85tul0em0fdbpu3ggb80/lizoborogadebetikegito.pdfIn PDF document text
    • http://jucal.es/images/file/puvufepatumigevuximu.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/zenoluviwonamatibuvijux.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/vivarubuni.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/79180325326.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072630cbf019---wazetaxokelenexuvumo.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/vodudaxedivuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=caracteristicas+de+las+figuras+geometricas+planas+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_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 21416 bytes
SHA-256: 2e69b91231628a1f24eb6258ff4a73a80ce978e72ae544b3519ccfcbf9e1feef
font_01_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0E 11092 bytes
SHA-256: f512a7001c4852f7627e442740e35124b4f24a3c96cf7fc9adaed60ceda447cf

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