Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed80fe4559956bd7…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 15:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c543013ea2d137a4133909a7f142e0c5 SHA-1: 3b2a1ba30ff9d8383d5b9eb59cf7519ab50df82f SHA-256: ed80fe4559956bd70fc4e165911e2af95319773bf25600bb0ca3276567d03ee5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs, such as the one containing 'utm_term', further support the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=the+legend+of+zelda+twilight+princess+emulator PDF link annotation
    • http://www.autodesguacecoin.com/ckfinder/userfiles/files/sofatubogawekupugun.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/bazoponoji.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/48785444251.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210912_223307.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/gerijujibefij.pdfIn PDF document text
    • http://ceroki.com/image/files/21204310326.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/favaterawiwunar.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/39064214338.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/45088521602.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484ad64b595---64959587316.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/9730290946.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/rexitulagiteredivigubiwo.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/rinolobigonowewi.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/26252668544.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/pejewaperalorilovilirimu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ef48b1eb---xusawufiluxo.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/90317595924.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/38302867870.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135daae3c0bf---22868547482.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/regofafokofijapagifo.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/51617462660.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/fizapug.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/wipogug.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/dideridob.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d2a3a825235c72e57d32cbf380727d0f/givijenamevuxis.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_off0000b0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E9 11276 bytes
SHA-256: 99c8367a6073ea09f4b56721def96ce13419aae5529807b4a14c3754542a82ec
font_01_sfnt_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 14688 bytes
SHA-256: 80df6c394cd047b60e1a3a0356b74f2a50a702b58df9c1dc4f4e98c812286fcb
font_02_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1