Malicious PDF — malware analysis report

Static analysis result for SHA-256 40aceb13fef8c4e0…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 01:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b757505331cf00d013a5c33b7d5786f8 SHA-1: c5de9c80ffd74ebd4140c8693521e1a51c64d9bd SHA-256: 40aceb13fef8c4e0eda57809971728cd7262296dc151b2390e3b2fb2eb663a57
176 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external URIs, with several pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The document's structure and the presence of multiple links indicate a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ourlady-schools2.com/userfiles/files/simiximoxumi.pdf In PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/1361016287.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/jirudisirokatutovimije.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/4073721864.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/nufopobusokate.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/91481345223.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b8858f6eae308089c64c5d3684eb3f6/metajasi.pdfIn PDF document text
    • https://sainaudit.mn/File/16747728255.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/ludizaranaxawikusibijud.pdfIn PDF document text
    • http://4bx.pl/public/file/95034364023.pdfIn PDF document text
    • https://producto.works/userfiles/file/98071148789.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f371lphma84oeqg2skn32cqcje/dumuxekefakatotuxunel.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///lavabiz.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/54210874205.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/jitisonanozolalotu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161429bd220179---nibutarijof.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/12116290281.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/tituxivutitirejirizu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/32c231669ff3ee98fd4eb01a2ad60198/91060609206.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/20796204389.pdfIn PDF document text
    • https://fptica.ru/images/file/jekata.pdfIn PDF document text
    • https://akemi.ro/hirek/file/22446023200.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa6f5893e2---70304659200.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/jowomijexunafuwoginelas.pdfIn PDF document text
    • http://altus.pl/userfiles/file/wawopadexunijatufobafa.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/76554569752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+car+mirror+appPDF 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_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 17256 bytes
SHA-256: e2b8f992c42b590269e023b6f9a716d382659a598bcafa9bca51feac83064f66
font_02_sfnt_off00013241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13241 10212 bytes
SHA-256: f27800238824cd7640487680694e55524e7b4597636013f76b8013ee54495030

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