Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c86efa5c6fa4a04…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 10:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a948718c64c88eb5be3cfe42ec723e39 SHA-1: 9f6e58e2d8c2537b4f4cd83ad3b9a6a10b3eb0ba SHA-256: 6c86efa5c6fa4a04472b49f50782d31fdfdafcd1d777092057d5d22d78883209
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further compromise. No scripts were extracted, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aptitudeclass.com/ckfinder/userfiles/files/48766147353.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d628417e6---lutadadejaweb.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210904202305.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pkiqgejubue26gobcq5v001tkp/36297477438.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/lotizivorixejaru.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b48538998b5036001a85eccc544be5f3/8204995232.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/laruzuteserixuv.pdfIn PDF document text
    • http://pestresolution.pt/site/upload/file/vigemuj.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/nekozujofaximoxero.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3a94e0d497d689f6bdfc7643ee859c31/27993616947.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/loforikaridigisezifiv.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/lasepasisariwer.pdfIn PDF document text
    • http://devison-matras.com/upload/file/43322778610.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/lujivafuxebegi.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/pepegekaxus.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/32435357589.pdfIn PDF document text
    • http://raczcsalad.hu/files/70299769046.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146755004c08---83500577468.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/66395393448.pdfIn PDF document text
    • http://suitianhose.com/uploadfile/files/libulixibazuvofidamobeb.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381054de55b---4140468931.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/bodanolidiv.pdfIn PDF document text
    • http://dezis.ru/uploads/files/geguzakiv.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/49692111623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cleo+cheats+gta+saPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 17088 bytes
SHA-256: c718d0f2585874c6ee2f23f2a65de9567fed3ab724a797f6452b92c66ab5bff4
font_01_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 10244 bytes
SHA-256: 004c4da3d48bb6dea6c2a51f2c2e54b1930a72019d1c5b06a5f27a1e8500b534
font_02_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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