Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd16423f09b72968…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 01:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df884002508f37a9698fe562c59f54fa SHA-1: 017a1db613f3e3e88c01368f8f4640f23b0daf9e SHA-256: cd16423f09b729682f381f143e7b9fa617e28aa2e59817c345b8c186dc229f35
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a link farm used to redirect victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=opus+clavicembalisticum+pdf PDF link annotation
    • https://kaptenhoki.info/contents//files/10955203035.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/73496994873.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/9b2542e1c8bbc04f283b4a2a0736cb1b/wosubaj.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/de649d4eaa2fe2eab189b98f54a3b4ed/vapedikokewubo.pdfIn PDF document text
    • http://packturf.fr/files/72535935158.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b12f1eb81ea0602210ffdaf8a560d963/62246841803.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/9676502514.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/winojajagamorun.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70aa69c806---16549013325.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/82068611468.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13688803562.pdfIn PDF document text
    • http://calisnt.com/uploads/files/23618928773.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a2ab75ce---tamex.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/sotutebapojikifofivux.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/gogalef.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/bosobo.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/tunolanaj.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078038eb61a7---3899959448.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/movidewize.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/bikaxuririrudupimamito.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/u7es4r6hhgpbhll1smke7npl44/tugovij.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/nezodevojesebosaz.pdfIn PDF document text
    • 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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 19040 bytes
SHA-256: df08e49f37ab446951a4fc8fb22da24cf5c6b16a3d62acb3ec5cf2517a860098
font_01_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 10788 bytes
SHA-256: 5659932a496b0899c97c8f97456197e827d50bbe32fbba70aff7ca208c3bfa70
font_02_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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