Malicious PDF — malware analysis report

Static analysis result for SHA-256 e783fd4328cf7bff…

MALICIOUS

PDF

73.6 KB Created: 2021-09-24 22:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42d2d33f8b78f04567ad7f71296688d7 SHA-1: 42a630854294cb262cc50d5125cd3d98e68e82d1 SHA-256: e783fd4328cf7bffc71a6e4488df2940316e07208d3b11d47b3a62a6752fc293
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous small PDFs that act as link farms, often using UTM parameters to track redirects. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=real+credit+card+generator+2020 PDF link annotation
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ee21a04c9584ee676216d1f7e590ac85/favibizet.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/xalux.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/45882634858.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/35460831531.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/wesoxofexuwubuketifonatex.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-8/20210908113656830775.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/33037041013.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/58558330722.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161413d9d3536b---vodixogoragabif.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/46904953300.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/pabigug.pdfIn PDF document text
    • http://masonhn.com/d/files/budowuz.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/76153297373.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/katamozadofolapuvipewofif.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/77276592280.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109031918387189.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/67776458571.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/dozifasetirokifamifuril.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/migawawizinabijemaluguw.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/wunojupulanas.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/12940987399.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/gosir.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/gitumunanarefakerasebiwe.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f727c70b79---zomugizumemad.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_off0000b962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 17400 bytes
SHA-256: 76d962861b06a7b83a3fe29aefed6edf549ce66a8ec1e4a731cdb7c1b2b2a624
font_02_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 10664 bytes
SHA-256: f92491c6978e0d3218706ea76c59192014bf221c6373994ff119538a2e51b097

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