Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4dbf65fc4b322eb…

MALICIOUS

PDF

79.6 KB Created: 2021-08-25 09:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 410235daaf30e8c240c3b30dda84f7b5 SHA-1: 4eb6d7711a8ee033bdea93bf2ffcceb015b66ee1 SHA-256: d4dbf65fc4b322eb2e89e908ace865c994463515aaae613d16dcc094180c7f12
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to facilitate phishing or malware distribution. The presence of multiple external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/312f07b8427661d3f2fc561ee671a9e9/pijakojademozizis.pdf In PDF document text
    • http://erex.hu/upload/file/15504737495.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa1cc0947---43220579185.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607071613fca2---36600034137.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/gizusifewukusoraremojak.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c11dae1471169e664983ce3abb42144f/dirimafawamitujub.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tepoxopoxemo.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/jopupakejobemu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9e886044949191d4e63eda6a9ed4549f/71080226907.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/felexuguzabepowel.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/14885666251.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/pugekedugebor.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1611615cea9a8b---raxarunofo.pdfIn PDF document text
    • https://baglab.pl/galeria/file/wevifaletizipexoram.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084767bed021---fixozisuva.pdfIn PDF document text
    • https://ghnservizi.com/file/giroguwike.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/13706565322.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7fb0139b8---kokizekegegarinujupidada.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11af0b451---bodenu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee799b98807---89023521544.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/62cfa380194b872811218d9aab47eb24/meporub.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9bf166ba---60324846912.pdfIn PDF document text
    • http://abc-tel.ru/data/File/nexobadop.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/42842824353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=brskins+minty+axe+codesPDF 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_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 10844 bytes
SHA-256: 839355af802148e7de4e2b5e893115e586e788cc8c1b6a3a431c85acc8306845
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 16856 bytes
SHA-256: e955d88d31ca9289dcf729d5cd4297cbbbeb84b067e0fb3d9709c774f2a41c3d
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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