Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4275e1aab8273b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 03:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21e4f052b5a47e45f8dc73aa896c2938 SHA-1: 3e76212b321f5060cd0b0e5cb0f510f2f09fbb89 SHA-256: 1b4275e1aab8273b7cfacdfecf092aa952dc1f915ba37526ae7136aeac854c4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or distributing further malware. The PDF structure and embedded links are consistent with a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=create+pdf+from+html+template+java PDF link annotation
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8f8a3166beab7baed4633a921d5bf934/77412585790.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/papadoxarajuretexi.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/83891210390.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/kowezobebowijo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dad8bb39fcf---72765120529.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d221f736b72---likusexusu.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/99617454911.pdfIn PDF document text
    • http://caramelitos.sk/files/putofukojuzateju.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26baf6b127---74990312419.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///vidiwazazefigagiso.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/saxij.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/rumutuwapem.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/lm5spqai4mj9bq5acb56l2j854/1737660954.pdfIn PDF document text
    • http://eventechsite.com/files/files/43614204634.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/28305223371.pdfIn PDF document text
    • http://shahgrp.com/uploads/63501372603.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/juh5u4kbmbpgckltgbuma4d49q/32978615260.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/38322775249.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/r4jfbgq2ink19bnt1u1j5tpu1t/98214549010.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4803c8538---sotovumelotinifakorikisos.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/18237413541.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/4302301583.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/fexusupobobam.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/bedubijugetawitut.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610427cc0082b---wuvizogerod.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gabusofegimoj.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_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 10628 bytes
SHA-256: 389a40e89042fe00983d98eff89309ce80646557888a8a953992c4cab1829704
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 17124 bytes
SHA-256: 4fd2b7ac9fb0cf5573bbd0f107af6d218d490b687e83139966cb5be58883cd00
font_02_sfnt_off00011ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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