Malicious PDF — malware analysis report

Static analysis result for SHA-256 42412a5c9f565eff…

MALICIOUS

PDF

69.8 KB Created: 2021-09-04 04:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cfcbd677ef75516848e950699e908521 SHA-1: cf6cdc48621aa7f0f4e6e1d9ab30249cdca0f1e9 SHA-256: 42412a5c9f565eff68ce3d98d1635e96b52e38bdf01edd6a94c052d49ed20a61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=erp+implementation+proposal+pdf PDF link annotation
    • http://espacioschillout.es/images/admin/file/badujujoxog.pdfIn PDF document text
    • http://inistor.com/ufiles/files/vokexezokewifigubiligel.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c5b59409f635484801afcf39d6e88908/35244233080.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/18185958842.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/19851641493.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/nakovorafavurarutelamad.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210820174204_776690030.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/6469535533.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/84811828741.pdfIn PDF document text
    • http://congtyvima.com/images/Download/nakejutagidoferesojo.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/rifutum.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161164a330ab65---rikezupivigisorelego.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9942a5170---49087647430.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d1f8e2150---99344285091.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5436da68a5dcb30f38318731faac26ad/domalenup.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/gabete.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/fukubagiloxuvabegu.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/tefesolapotem.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093b060328cd---sufaluraxiw.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9c313eede2a8d3aff2d8f706db9c0746/rewuderef.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cb5ffe9c5b052399f197ba51523085b/bekezejalebaw.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a6c7aeb2---risuzozak.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f9a63518470800fdd0b189da2850892a/40203607758.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/2f282434a3e52b11a621241e71b03200/dapojudesuven.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_off0000b5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEC 14388 bytes
SHA-256: def8eec7a115f7137daa3c066bf1d11bd97587e6146a9f645fb5f3f9a5e82f68
font_02_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 10644 bytes
SHA-256: 664272927332af6e7c3079e9c1722a69ba6e5727ebff5bb3e91549de4e1ffe89

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