Malicious PDF — malware analysis report

Static analysis result for SHA-256 967f80e0115c9d4e…

MALICIOUS

PDF

91.0 KB Created: 2021-09-16 23:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e06bad2df427dd404014c537a2dab7b SHA-1: b2e879f299d28e37e1a87064820b68a0da9925fc SHA-256: 967f80e0115c9d4ea8b3615df153bf27505de53fa6b763d5d7a82849829d6587
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a link farm on disposable hosting and a lure to copy/paste content into a command-line interface. The ML classifier strongly flagged this PDF as malicious. The presence of a 'clipboard command lure' suggests the document is designed to trick the user into executing commands, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://cructi.ru/uplcv?utm_term=install+android+studio+arch PDF link annotation
    • http://wasserentkalkung.at/ckfinder/userfiles/files/mobabigiwejakadisofe.pdfIn PDF document text
    • https://theurbanthinktank.com/files/40570129539.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/vadubenovaterumafek.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/jasositedadanoduba.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/59954204621.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/9252752398.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/gajogidozebiv.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/mefiwexenasisorusegi.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/420b0ec0aba55f6778ce731587cc046b/16684511843.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/89479278940.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/dimopolunoliva.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/lovokuwefifefe.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a92168fb---80757257071.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f07274e374---75161400054.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/besojedibatubox.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/tebajiker.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/87462510810.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/34159785894.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c873b3089b---66448247367.pdfIn PDF document text
    • https://12shio2.com/contents/files/85319094321.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/53042715482.pdfIn PDF document text
    • http://ellev.fr/upload/files/77518963305.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/20267862245.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_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 19004 bytes
SHA-256: 03cf612c0b59af69b6db289d6bb63f57cfca6c7f3bdfba7ce2bd569b381e0304
font_01_sfnt_off00012ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D6 10384 bytes
SHA-256: 2b5fa4dbd10923c32ee0cef88531d0aea2c20db8bb60f77d6e3a3e1065ade234

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