Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be03a98bc3214ef…

MALICIOUS

PDF

95.2 KB Created: 2021-07-03 01:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0b0752e650bf8860d22b7abd0488829b SHA-1: 5c6c5eebae2260853e9269772b2d353ad2110f6e SHA-256: 8be03a98bc3214ef90f24cee9bc1d01483d2652b5760893924bd363d55b711db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the structure and URL analysis are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rufc0mvocf5ei496hg4eejkack/76579382478.pdf In PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349955fe8d---78239942943.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/80537059995.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27bbbdc49---62471391318.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9eaa29f9f---bawifujabutanewedujibuses.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160996eafa1985---movazojafuzajiguge.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/aav5asmk8lsucpgqcif200hne7/padunatapukazapuveja.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dfdeb93b6---fakoxawavesesorigox.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ejksc6puv3fqgkmha4pomagb95/52155628076.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/3eddbface19a26e961a6836eb23514e1/65325100076.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072749f2d474---vofutebozinesejarud.pdfIn PDF document text
    • https://bonacorsi.it/file/63235079384.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/xenofapuselafabusifut.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/totivoxususasidipatitol.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/8016338774.pdfIn PDF document text
    • https://coil.hk/upload/files/fasosozagivifobevuwusifuf.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/rewefara.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd5a32d80---32854640934.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/50cdd4c929e64c4f7f20445c0d97bfd4/kasefotosuzexiguvabu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/nunexopilorajiwafafekedun.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/08294fb3176ec6e75bd7af5c148655b8/domaf.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/lawozuxapakegokete.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d905c2b4de---89791337108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=family+of+3+poses+for+portraitsPDF 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_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 17588 bytes
SHA-256: 827cbe3d262321ed277a8309591ed8a249ad5dc6b5517add0bbc0a644d608f98
font_01_sfnt_off00013eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB5 10680 bytes
SHA-256: 7d9dcf0a989939fff92423b15b1a446ca1374a12abe912524de5c7aa021503f9
font_02_sfnt_off00015749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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