Malicious PDF — malware analysis report

Static analysis result for SHA-256 114bf244bd2fc15d…

MALICIOUS

PDF

79.0 KB Created: 2021-08-09 17:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4c66fe6fc460237e9765b938633e735d SHA-1: d49551a38580be5d6e99ab23f391d6a6d939fcb7 SHA-256: 114bf244bd2fc15da8bc8c48e53eb6e748e666e4898f1acd81416205e9d4f7a0
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with several pointing to compromised WordPress upload directories. This suggests the document is designed to redirect users to potentially malicious sites or to serve as a link farm for SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of compromised CMS links is a high-risk indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=multiplying+and+dividing+rational+expressions+practice+answer+key PDF link annotation
    • http://frezerovka.by/images/fxeditor/file/30958419949.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/51793439890.pdfIn PDF document text
    • http://cy2hand.com/userfiles/4842253764.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/71211010105.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080317c501c9---kefedejipidilexemefitav.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/bobewugozewekisubilo.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/18152032782.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b60645354d5db5e717f07d3f8c140494/35603936036.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a5c628890---20154800825.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983d8c99025---buxogutekipanexef.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/53997743732.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ce0dea2b6f8c0b141b7cc6b62c32e0dd/bonuzunawozurasujasibolo.pdfIn PDF document text
    • http://banquat.com/userfiles/files/telagatafibovino.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/92490036010.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/xijopigalizifizenezida.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/mozuxawogimizerifoteb.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63cfcb2f9d---93623190823.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/zureredixej.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/tibiwatifivomijofej.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4783599abc3f7e98e8e72b9d2d54d5ff/48273042759.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/diwirudakekunabad.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/87589131770.pdfIn PDF document text
    • http://placc.info/up_image/lezelilagafatutegibazaruw.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/vemusarubarulojedigu.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_off0000ce8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8A 11244 bytes
SHA-256: 1c03b4cd67306fff74545e0806bca697e60755908901889e4b4c6456daa380f4
font_01_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 17160 bytes
SHA-256: 696238d4e299c3e2669df9c0d5cb0a45559f2af5b08fa43be6399c1df72874d7
font_02_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1