Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d9e2acbadf2529…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 05:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc5df90bed7997dec23537f3a2b779e5 SHA-1: a588682e4248a99b7830d9f1b4d7bb6f4a7fa62b SHA-256: 20d9e2acbadf25290c883ab6bbe393b9f2f8d538a51fcb83a6879c63606f1950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of external links and the 'compromised CMS upload link farm' heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://oniceh.ru/uplcv?utm_term=ultimate+custom+night+free+download+apk PDF link annotation
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/30671587340.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/2616625761.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/tawavifitasisotef.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/79754550714.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dobujumobig.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5107bd1a1---dibezezejujafevadivokekit.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/6907325354.pdfIn PDF document text
    • https://hkki.org/userfiles/files/wetosobagewelomakefonorem.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/12679796548.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/mijegifodixuwurugedapa.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b2ce6249c82050be4093edc6e898b497/fakezifaporajuvetej.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210913_192736.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/mejiwamupimewo.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/19367848469.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/wufurewudixatakul.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e229a7fb05---tuwezipesekopagekavijodu.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/17699741892.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/sazitezuvalodeba.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/pafumawebojijanutatuka.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/nisepovizorosokadozavo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338f7a3c3ea---tawajup.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/94e32ad7a539c56a005c35f8fdf17ccc/zufedazixipezi.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/bizusexeforitagokurigabuw.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1614255926ac3c---53148072844.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/39906424057.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/90936526221.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_off0000b3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A9 11352 bytes
SHA-256: 6b36af033db9fd27e3ab39efb395536d28a2a59cefd6ce6362a08ae2fddc2e90
font_01_sfnt_off0000ce07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE07 15540 bytes
SHA-256: 786859be14774c2d8f55f3ef4a9f3ccdc4623f6c10104a22f4bdc1c97f297389
font_02_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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