Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd12441537a8db9…

MALICIOUS

PDF

82.5 KB Created: 2021-10-13 15:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bec1ea46a5bb6254bbdc1578666b10f SHA-1: 25c7b8f994b21b15dde7695d6a24e74b465d6afa SHA-256: 8bd12441537a8db93306f69e1069a59ad90a4d751bcdecdadf1cc1045249c13e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised CMS uploads and disposable hosting. The embedded URLs and the overall structure suggest an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://planet-pvc.com/upload/files/2347335234.pdf
    • http://good163.cn/Uploadfiles/files/49384259645.pdf
    • https://ccenter.ro/userfiles/files/vebojaboromeruxor.pdf
    • https://mallarpurnaisuva.org/go/file/38677743954.pdf
    • http://ltpbetel.ro/userfiles/file/nixopebu.pdf
    • http://esteel.my/userfiles/file/83120529470.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392eecb4956---43972043162.pdf
    • https://russiancosta.ru/ckfinder/userfiles/files/33428099010.pdf
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/gidufonotofeg.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16156fbae090af---rixumufos.pdf
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/zujamisitu.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613510633064f---rokilozikapirex.pdf
    • https://candica.pl/ckfinder/userfiles/files/37617468736.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161474809f3438---zopiwelozanob.pdf
    • http://studioferrato.it/userfiles/files/dofapiz.pdf
    • https://gites-les-bardots.com/userfiles/file/vepen.pdf
    • http://zatexpress.com/upload/userfiles/files/nadotepo.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e23f77ecfda458cc479c3ad1afc6e42/20220616915.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a20d1241df---90630177025.pdf
    • https://ddnepal.com/assets/userfiles/files/92430298658.pdf
    • http://evohome.pl/userfiles/file/kevefememipovo.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1616528a34e2f2---52135953025.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/kexetizi.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=two+toed+skink
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca8.bin
aa9a16f2ea32df88c3673bc844d3f8990b2e1023edce8d34e1973397f17fec1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 19060 bytes
font_01_sfnt_off00010e1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 16792 bytes
font_02_sfnt_off00012631.bin
c923e5d61462bad67e36f71809aa946ad18b60ea74e81fd9ce0d7d92cbc9c8ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 10076 bytes