Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bf9e0b49163f36…

MALICIOUS

PDF

87.7 KB Created: 2021-07-01 21:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bdb07f475bf833dfe335add2dee023d0 SHA-1: 79c97634e8ab745a0d6906c754e3011430fe2005 SHA-256: f3bf9e0b49163f3650c45671092d72425fa42bd490c97ba35636309c577b985e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=ark+all+dino+commands PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6b121927d87e4c9512342d39daff4710/71677652874.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5622344b72---gaganodate.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/87975145865.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/3627581042.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e95b0ca60---99715361521.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a80238ef9---gijoxuf.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/24817728350.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/75875378111.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/bejaxumukexidesunosiwobo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bab42da5d83---88603129432.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j7mll9omoi3eirnkr7vgmkam0h/sugubirekukipisid.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c48ca0d1db4---23737881924.pdfIn PDF document text
    • https://airbays.com/userfiles/file/nufomigepamomafurafegova.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/2138828079.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/rnupn09a1j15oe562qocnm8iq9/zewunawugogavonowekozini.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b05b623e---19439893161.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d189981f---lofepenosinogimifogex.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/bisenifukad.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/rifitigejabuwisuje.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9297a13a---16057119568.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/1c4iqmrfsq28hbvdt0or7h345v/29121479544.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c4f6b139e4ca892e53deb5a06b3626fe/87709655186.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/vizomub.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92cd5afe13---20625281096.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_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 17004 bytes
SHA-256: 827b336d5744692971ec8aef5899ac6b80f2bdffb91180b2fa5a9cfcb4ad5a19
font_01_sfnt_off00012243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5A 10376 bytes
SHA-256: a4f0f2afc2e11c10f91dffde2cf5399ae1c2b7a4612cec57528d5b2f63197c0b

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