Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a49249771a4e80…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 19:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0919ee40d8da4ad185301954ae2b9af3 SHA-1: f62a83289eb7d82c7c11255ec8ad4840e66f6e77 SHA-256: 28a49249771a4e80bb61b810c6f674b04f19461d2ea4361ef4440024e52584cb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable or compromised domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://inncredel.com/uploads/22570563426.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/49ar8g319p6dl9lia33nspdtjs/8110819921.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/pabopagamitipuwa.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108282308059688.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/63998582351.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dc49d1e3dfdcee7084c52b1f5453d84d/zagapeko.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9942caeb4---22483799905.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/71677809207.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/20396199920.pdfIn PDF document text
    • https://soechi.id/userfiles/file/16371056600.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/69261556620.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/eb0a7c110e970c53170f6a4d842acace/zimezabesitemidoveredugo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/61dd56e1b57bfb6a53aefaffc1e85402/96642702591.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/21083003062185217516kzbg.pdfIn PDF document text
    • https://chp-travel.ir/data/file/gumebanodaxofoguguza.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/efc1669f62a9b630ac073ed4e6c413ec/32476609718.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210807140227.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/pesirusina.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/37682534399.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/83997781752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+solve+equations+using+matrixPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/38336272673.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_off0000beed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEED 18376 bytes
SHA-256: 35b16b82632e5b60b0907532d29840085739cb04231e3622a280df3844dae84e
font_01_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 10940 bytes
SHA-256: aa9ec3941dcce8648b9149b0a74576956b9fbb1d498979c5f2b7fc16bea78ad3
font_02_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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