Malicious PDF — malware analysis report

Static analysis result for SHA-256 990886eb33b91149…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 01:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5e70f4d86c12a140bc44459ad31733b SHA-1: 81b3b85b684788c031c8116f681315587283859b SHA-256: 990886eb33b911490f42a5c82cac7147d20cb861b90c6978c417b8eae69eb666
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alarouba.com/ckfinder/userfiles/files/rejizuxo.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/273074bd53edb969f846860693860001/gekavuwibofowonanigu.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/namog.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dowedokadun.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/91205178855.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/sizekaduraluvosijozo.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/finizave.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/ribifitudujikikuz.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/feniwadobofeki.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/sifox.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/nnin5lv64mqk5dulvik99r0847/fanedidadokinefigexodo.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/vozirukibegedev.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/99871796570.pdfIn PDF document text
    • http://rococosofa.com/files/files/52855598320.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/36571592858.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/10859474884.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f16c4e34d---nimipusegegenaxubizijez.pdfIn PDF document text
    • https://stopserv.ru/files/file/kavuxibowidoluteduz.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/95783065385.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/laniziropikekexuses.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ef167d41---paxezigatipafetu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc72c12259---dajaka.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1790a505b---kilojumenibotas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=weber+bbq+instruction+manualPDF 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_off0000c1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A2 17164 bytes
SHA-256: fbc5c0d782c7724400ed99757624baf750bcd49cf0e72f91bba167e99e768db0
font_01_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 10768 bytes
SHA-256: 054efc17fdb8eb1df81c4cd3db715519dce26381a03c277cb9f3ff0df2f13a55