Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f711258ac542d72…

MALICIOUS

PDF

95.4 KB Created: 2021-09-01 08:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b0a61e65d85af1e67cbdac14c0b3382 SHA-1: f2949597521d7daeb81154de4a4a7ccefc00230d SHA-256: 8f711258ac542d72ad144986e65ce570e95bfc2c6962e03fe8539dbca1231c13
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=it+has+been+long+day+without+you+my+friend PDF link annotation
    • http://cablexconsulting.com/Upload/file/pisixemibebub.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/od121fmleuj3758sc57urn073f/61348246868.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/j4ei29o1k58ep8pnb5stssqe10/xanosi.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/46445788154.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1efcd8ef33eae53ea1e91739c1702779/subotolanemunapenubet.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8cf83230f76eada9c6288d89d8ac1f7c/fubenadotaxagugudugalim.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/pesubajekevupivizebil.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4ahbfvhpo0o30rdqu1tomvl744/pizowanixawivelap.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/25373335.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/13109149859.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/64969222960.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/deraxedonimede.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/sudapokuzulobuzudiw.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6e1cecde---guxutaweluzun.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ec56d0ffd---23654715580.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/berawit.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae08e2dbc---90441340319.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/60v3r754d34ehdb1t34cc1lpp6/11097353181.pdfIn PDF document text
    • https://agermag.ro/mm/file/12083331193.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/kezujitiva.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c562f39391cd03554c8dc2de820d1110/29102320271.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_off00010fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D4 17876 bytes
SHA-256: 0b2a3d9a7ce26ff8555bb6cb5355cc2a2ebbf2e4962319a1d6726d4885d81a65
font_02_sfnt_off00015612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15612 11192 bytes
SHA-256: 23d822b82f45af9abc1c358305e867b3fcc9371793473f728f6c723b7e4ed37e

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