Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c6fc9021ce969b…

MALICIOUS

PDF

74.6 KB Created: 2021-09-14 14:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7eeac6bb87d4c3a767c44e92b0996a4a SHA-1: 7ae5429d9dc9457f042608eccbe62dfd5c90f93c SHA-256: 21c6fc9021ce969bc71fd152460139d95064defb84693e4083c1a73a0f80b14a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://libertyrealestate.in/ckfinder/userfiles/files/lifeguvoginozapesomabo.pdf In PDF document text
    • https://aporpeter.ro/userfiles/file/38976408355.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161310001bbf43---19209086440.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/75166542511.pdfIn PDF document text
    • https://gornjastubica.hr/files/32208117112.pdfIn PDF document text
    • https://everestart.com/images/stories/file/49413080371.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/samirifotetiravigonun.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/53104995313.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/90491325807.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/24088768383.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210912_023034.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/68183367445.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/zujamunupajoxexos.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612feaa19914d---gukofutavapafedalu.pdfIn PDF document text
    • https://aitalk.vn/upload/files/17209141493.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/76018702190.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/38748690897.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/fudupirasitodamikamasubip.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/tuvuzofezasidi.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/zefizilukenasaxudojavuzu.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/wosevomodupile.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/66051876974.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/57903247546.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/womezifafozokobinotediw.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135418264515---32371612480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=abcd+tamil+movie+prabhu+deva+downloadPDF 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_off0000c09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09C 10984 bytes
SHA-256: 077c5953d2d624eed358f896cc71c6b93fbe8be3431c39c9aa6c6e5cc40088b6
font_01_sfnt_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 16460 bytes
SHA-256: b33f238775a642ce5480e8f1d9cd5f8848e7319ebe667300c458b1d770b31c2e
font_02_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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