Malicious PDF — malware analysis report

Static analysis result for SHA-256 06434173a1841927…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 01:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25fdfd209bbc11a488a0a01f61127ecb SHA-1: 099bb49cc4e7de0b3304065e223c6d8f82060465 SHA-256: 06434173a184192761779e0e913d751d1d3f4af757e2826a9e6fc8a9e5a0db27
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and a link farm suggests an attempt to manipulate search engine results or redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=yamaha+keyboard+piano+manual PDF link annotation
    • http://old.smartplus.pl/ckfinder/userfiles/files/merakap.pdfIn PDF document text
    • http://ridendo.cz/files/file/15063355790.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/6e7696635358129284902a6030794851/gefuju.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b59a26967ca---fulelo.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wilujabaganodanemeranilor.pdfIn PDF document text
    • http://yuha.be/_files/file/gafinadogevesoze.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/9585073735.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be1f9876a---topev.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/6602845847.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/97889471963.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/renutajomasotofole.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/zaxujuloradozerofisal.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/71279756795.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/tewuje.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/57018825330.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7bada9b105c72ab2855f0342bfd7c2bf/jikoxagamamodorubaduwozon.pdfIn PDF document text
    • http://le383.com/uploads/files/lavezamejibedojod.pdfIn PDF document text
    • https://energooptima.hu/upload/File/94801190320.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f97a38d59aaa9de56856322fa0640258/luxazenamubodomebaz.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/cldg3mmmfed6aaimirm8s78v14/sujituxotufilajekura.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/paxovatunurofunopubidopor.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/95613573432.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/kaneruwomoli.pdfIn PDF document text
    • http://cosyromania.com/media/file/mejiridugefemaxutu.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_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 18084 bytes
SHA-256: 6abdc7def467831e33bb861145b6145f3b710fd0b3dd901a69705666c29e1846
font_01_sfnt_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 10820 bytes
SHA-256: f0da0c7445e3fff81457ad422f4e4177d0cad4eb8acaa9cbe895820e1baaf065
font_02_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1