Malicious PDF — malware analysis report

Static analysis result for SHA-256 221e3a9a3d688c6e…

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 09:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd3be95e2c8fe3d4250b36e4fbe315be SHA-1: cb814371210b85a5a3cad878d5e73e7eb611732f SHA-256: 221e3a9a3d688c6eeed36d16e97a67ead72d69f0388c9246dc5438ebf7006d1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4879f8638a01f6d79c62501be328dd65/82910474892.pdf In PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/gubidikoragi.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/70855713131.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c3278cfe---90009367834.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/67l62c5blcjg1if2n9m39ju522/91341872997.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a06446756ec---5049853659.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/72552903006.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/86443996849.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1679953767609e68105c607.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/643b57ae84b8c6fbf029f4f51680c680/vekisodowalidefajeze.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4c378e4c---43168128768.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e270abadd9---mirodujivibig.pdfIn PDF document text
    • http://teraval.cz/res/file/12591283258.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/58825895729.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d88c263e0---74266886186.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/bbdf47ef55d1039f82f2c2da0bdbcf91/61749240105.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/rulaxorak.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2u5alqcqrahgfe8gvc27all965/sipabaluw.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/40ad113e4e3efc6883ad60982369a69c/10181770330.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/78176166860.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/2dca33faab3f3ad778f5f075197d8951/fetuwunotumefanix.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/62080945798.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d5104e3320a81aa8577de4cd41bfdf5a/naniguziwevidexefizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cara+menulis+daftar+pustaka+dari+internet+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 16860 bytes
SHA-256: 6968878a3f42cd4ed83235092ae29137aacbc6939bdb40319aba6f253ee5bb0e
font_01_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 10760 bytes
SHA-256: d5df7d7b3189efb0a4592e3c56db1a15cb1fcc33e9589642e9fa9f4158466756
font_02_sfnt_off0001331d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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