Malicious PDF — malware analysis report

Static analysis result for SHA-256 4069f33672cc70f1…

MALICIOUS

PDF

75.0 KB Created: 2021-08-28 00:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed03879f619909d36a50c28e016ae851 SHA-1: 7a24840bd08973c96a243cb4e0e583194f9d3895 SHA-256: 4069f33672cc70f1ee7b3e667337761ab2f95db617a6ebd6f1fef70cf34f26fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple domains, some of which appear to be compromised or disposable, directing users to download files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://qdjshg.com/files/file/58860329437.pdf In PDF document text
    • https://aimtronu.org/userfiles/file/rububurejidemaxe.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf0af283a---fagexezogijiduga.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/89303118779.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114536656ee9---17176720459.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4de17db4acf9035093eecb1b99e8ab80/91525338421.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/rabun.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/zukarumi.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/141ce133866ef136c2d51790e979be4e/lijezoparoravobi.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/85100315714.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/mejibajafozafesij.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/co8ea1td24urdaltk12s20v641/82662687874.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949846d6fa1---mopinetoval.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/39921694691.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072659f0048f---kodabiweragipaxewa.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/wujilobisapakizozedumobi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45a6bbb443---46253586255.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/vizulawanagibopit.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/wanalanomulam.pdfIn PDF document text
    • https://noddy.nu/images/file/sakira.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f28048f32fa6876b5ebdb2e5b4cd2eef/47023928018.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/40iu094edh826obhcfbb56gca4/25941232025.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/gemamexililoluvibotodafur.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/4970543234.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/56696123002.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/72779836786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vlc+player+apk+download+for+android+tvPDF 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_off0000c29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29A 10772 bytes
SHA-256: 828238adb5abc1b13332eddc0dce46e9d23cf031d1081b7281056d38e03697d5
font_01_sfnt_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 16100 bytes
SHA-256: e0e260292c0ed79f5ac654606bb4d347e364ceaa9f199644aa92ab23daa1a58e