Malicious PDF — malware analysis report

Static analysis result for SHA-256 473884447cd8622d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 03:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2085b90d1493560c7f8b2f53403b660d SHA-1: 8b8d6f60abcc99f412ef4c5c8daafc39867dd4ea SHA-256: 473884447cd8622da8ec554c6cc5584adb52603928704d17d25f7be105a2d0dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the structure suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4f707bb4---tamabopulif.pdf In PDF document text
    • https://uleiuri.ro/userfiles/file/jafuridawivow.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/jisepasirizupubega.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/75bfdf2c85d78a1796920b7f42b07702/gamazatid.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/l8gtn46udilsg5cv8c3mlc0ai4/10155372689.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608401989d505---50414948109.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/sugapupafoxubo.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/lepupowi.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/64030996974.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353790c4488---87905947990.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/99004644538.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/binikexujinipibik.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bd2046a1befa015eb142249c6b49bcb3/80297138426.pdfIn PDF document text
    • https://andana.us/files/files/jabun.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210615184827.pdfIn PDF document text
    • https://aokman-drive.com/d/files/36144458152.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/u5djfqvsvgi0tv60nds1ad08e7/22802332772.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6e227086---14938060657.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/89020661703.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/bca90149aea60121fe4dfdc277ef944b/39831269504.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0eb70f773c71bfa4d9f4532b85666cb7/lexoneruwegugetokimif.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/defotaboza.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/65782646154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=florinefe+0+1mg+bula+pdfPDF 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_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 18956 bytes
SHA-256: 10ff868bbd73040d04f36f0df90d57557fd3fd8543afd5cb4b7f6c51b3a7b492
font_02_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 10964 bytes
SHA-256: c0cf3a8388365f3d14f5cf8b38225887759b68eaa7547252c188536bdef0ab45

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