Malicious PDF — malware analysis report

Static analysis result for SHA-256 863b709aeb1b7fe0…

MALICIOUS

PDF

114.4 KB Created: 2021-07-02 14:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5dc88f8254376382e7fc06b8595dcf3b SHA-1: c461c354c05b085fc842c3932aee7d58cad5729d SHA-256: 863b709aeb1b7fe0d76ed817db727ef010f5f1a66bbb3232cf847694661accc9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The presence of a 'Password-protected archive lure' heuristic suggests it may be part of a multi-stage attack where the actual payload is hidden and requires a password, likely provided separately to the victim.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=real+estate+math+problems+and+answers PDF link annotation
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/h2g8e9n8mhguibb345n1lmstii/febotimapefedamiru.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/f007cd4b31f52a25eeb793347706d584/16127755252.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883a2594dba---79124989920.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/6e305c1eebd2b3dbc4b8403e52d610db/39715642600.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/4316911296.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/79257033813.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/bd24255ebc6bb8b61f58118b696daa62/95807202422.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/22677082168.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ld8j655djontd12ao8l2ohf777/wuregewipojimad.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/51849363860.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/56763461a39ac127eadddde13d8cb815/77335600142.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/eaf3ba8ee766f5687c293abed587d882/67314397465.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/59111308514.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ttnl3qr9ko6l0jkpl5d6cnaqj4/mizolizewaluxapijoxaz.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/15327976649.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a62b055cc4b---vuxunogimosebig.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/1239568451.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c419690eaff8ca98f89f7e26a73e8f87/jositiwijuru.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4263989497---nizaxazilikof.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-24/20210524134944179307.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/30aaeb187f4a6581085b78be234222b4/zunizeri.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/902873a2c69cb6ac8b3acbdee087d4fd/nizitorisowopinoravefep.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b7817bc9580---85245792407.pdfIn PDF document text
    • http://canadanur.com/resimler/files/difikepadev.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_off000159ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17205 10836 bytes
SHA-256: 41bbd9fc112c336dbbb7a7d0e69214e3c3b49b12183c772f3da020a74b443ea0
font_02_sfnt_off00018aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AAA 18200 bytes
SHA-256: fa30216f67d31c18bd9de16273176cac4e8a4a5bc466270ee27ecdcdc17456ea

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