Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a190bd78bdc319d…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 02:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e8cb03682622fcfd5485bbd865557bf SHA-1: 6cca8763f37efb3bd8dded8a94ce78bac6f9eecf SHA-256: 8a190bd78bdc319d1633911435434eb935aceade3354627a92fcba2208371489
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, aiming to redirect users to download a messenger application. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://mar3ol.com/Files/files/gozeve.pdf In PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/5404041632.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210906_021415.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/94502362599.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/39570505743.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/77160721080.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/dezodovaditelezisu.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/jujedukajenekufiweseres.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0acf40d57---luveririrowore.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/lodebajoxosaderemal.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/dimapoxiwane.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/denofesusoxapisubeluzike.pdfIn PDF document text
    • https://okazionche.com/files/zegasudovaxoxurokopibare.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/todelopotorera.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/30794286300.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/74168735805.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/linug.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/da4i7grco8mcf6hrk7qujmfftd/78908559032.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/35995756967.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/83122471752.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7a48dd72e0838eb889465252e14f2aa5/bibegeniwaxonegasoxuma.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6qqb79dl8l5hhs55lrjf22r840/tonofa.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155d6e24fefa---93903773823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=faster+messenger+app+downloadPDF 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_off0000ae45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE45 15204 bytes
SHA-256: b9932aca0cb22a07ed264be6f2d36962420cf96ff93bf797d4fd3b20a1d26607
font_01_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 10708 bytes
SHA-256: 5579d9a4dafa15aa21268621ce2725c9c280e4355fe9648e5183a4962fc15a90
font_02_sfnt_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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