Malicious PDF — malware analysis report

Static analysis result for SHA-256 8425cf9029feb4f4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 09:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 75ce13bc27f9d9cfedc509f1b99a3ff1 SHA-1: ac450d440f82d7d2d0e4d6e3c4045d6711756827 SHA-256: 8425cf9029feb4f417fe974b361cecd4970b3d41ec70e2dccf490a6017d50560
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to potentially malicious content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://ubestsports.com/imager/files/20210910055807.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b05efaee95e8a4ce140e5f5d31a3aa43/48372847400.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/63154950278.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210903182033.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c890dc25c1---80801959476.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/vopipuvetakifubavi.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/25208355910.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/fatej.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/beroketi.pdfIn PDF document text
    • https://lapakunited.com/contents/files/77580040172.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/jomodozavetubobewawodup.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/12108063315.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/12531692209.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/68da6b7ab3ffc6f538fa0511998e855e/rapifin.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/7581747580.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/bomomogog.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e8405d9f89a8738fe9d5deca259af161/fozakofodijurabo.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/pewak.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b508250c2408f5426970d8e702038c0e/21186235043.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134100e760af---sibifiziki.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/zuxudafunemilixatewejexos.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/31968264398.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/lowexubotonefasudomebemu.pdfIn PDF document text
    • http://belst.by/upload/file/27855866904.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/bobalod.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/dijuvofaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wreck+it+ralph+2+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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 18580 bytes
SHA-256: 22026f0127b5594d0bee9d09fc932285aedf5cd030ad9350726a090484c5a28e
font_01_sfnt_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 10736 bytes
SHA-256: a9c4f9884c6bb0c95855e0427dde439e92f259701d1393b079f9090a14fa3b92
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1