Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bad2c89b6670f9…

MALICIOUS

PDF

86.0 KB Created: 2021-07-21 16:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 870cbb771559bf91a9c9546e748324a3 SHA-1: bb7dba60434996e38d4903cceed8b747332030d1 SHA-256: 93bad2c89b6670f95cedf288d48ff176fb18e2c529ce4bf2b16e5810dfaaa570
136 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains numerous links to potentially compromised websites, suggesting it is part of a link farm designed to host malicious files. Notably, the document includes an instruction to disable security software, a high-risk indicator for unsolicited files. While no scripts were directly extracted, the presence of embedded URLs and the security bypass instruction strongly suggest an intent to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/mefemofoxozitofa.pdf In PDF document text
    • http://pivotal-technologies.com/userfiles/file/togabasizorez.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/87eeb1e306a62f9032b8a7ac0ab4223b/58228561522.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607346cdb02f5---99308356876.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/gajapexowuxib.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091bb940b7cc---dosimusixaporusukozuwelu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c6c77525---bozemaxafove.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3808a8012e---jojozinebedosigorijibek.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/sifedakosexowezux.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083405b00586---rukalarewefusatuv.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/tanobadonusukurutadudiz.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fead488f8e---pavikedofofukuxufi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093bae46a68a---jijewu.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/59353837714.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/siroborusonoxumazazemiz.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/bt2okk9nhbtv6evim69u1su0tf/96629092576.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e813f618---44042422991.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/82369404352.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f0bd73463---11902989172.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbfee1890c---rodebuzupemu.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0a61f44fe29c12e525b276518dd05fd8/88762737017.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e347cd5342d59bf22eaaed2143916913/83188425715.pdfIn PDF document text
    • https://netlandschool.cl/files/1474205938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=slow+to+become+angry+bible+versePDF 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_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 16916 bytes
SHA-256: 58132063846ef981578b92dfee9a24915389dda98fd87cca8bdbf982a959ee63
font_01_sfnt_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 11052 bytes
SHA-256: 0de7d710156521ff0174a11ac890c0976550dbf42885bca01c2a775ebeb49d64
font_02_sfnt_off00013178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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