Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c93805a6565e56b…

MALICIOUS

PDF

87.2 KB Created: 2021-07-06 05:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 70d16367c251997f3149a78a53803080 SHA-1: 97fd91f1b7e5fa4cba1ce5aa46146652bbb07dc3 SHA-256: 7c93805a6565e56b479094f459295ff621b489d8c4cb2a460cb8c66869d18f9e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and a link farm structure strongly suggests a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4d55b1483211c5ad762fe77e5c6a7e1d/tojurig.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706e2728f3e---balisa.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/11b08e32f4523e74872925a27a5c9af0/vexekebijebexatozegitev.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/46146564581.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/xemuleximek.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/1dd482c6f916a4c1ee54e2b28f9f7a38/tamajonu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/bewamewozar.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/nuaqshmif71ne20ccg4e0v8t14/surizimeladafanix.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf7ce307e---tonedeve.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/mobebufisavibo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af804868e1b---5131543738.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/bd17af8a8af7bc84df1b4073f665062f/netugoxizareri.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9f637db7---polidipiteseloxuwo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160820ab92779d---wemonukufumowufoxatawira.pdfIn PDF document text
    • https://faprosid.com/file/67510496724.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415860174e---gomak.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7fab030ee---45751109118.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/8563352385.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160831af240b99---figeni.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca76318e1---nifiwazibor.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ca64b54661a---rotok.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/viraduxuxomimexapuvuliti.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/211c15142e7eee18b437c675beae4017/mizexedaviwipeju.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/91343193500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hodgepodge+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FE 16452 bytes
SHA-256: ce1de0e6b01546c383ed8e1266ad42469b76b7b3ba37d9f8695c4174f7e68e48
font_01_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 20808 bytes
SHA-256: 4fd723930cab8f18c2c40e6c5c9112b20aa9b984c678baa3e9ea0505eed1fa44
font_02_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 10632 bytes
SHA-256: ecedbf220435f1d08fbf0f0b11dfcebefb06f54a7731d671af6608e9c07957a2
font_04_sfnt_off00014092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14092 2920 bytes
SHA-256: 222682f23767244b1205cb43acf90e0d8c168b70269566d2819e6bf594a0ac31

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