Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d87f3c0630d9482…

MALICIOUS

PDF

79.6 KB Created: 2021-08-16 10:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 190bc3dd0c9104c4470fd91717f9c1f0 SHA-1: fc8bf3434536e4ae83a3789db29a167d3607ee10 SHA-256: 3d87f3c0630d9482b907dab26d334e08058673aba81c42c1f5d05d2acc601798
176 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to potentially harmful URLs for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/08aa6c30ba86a15cc3bdbea0bbf5bb67/12400680144.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160819f2d4c70f---60811267218.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d273d61ff2c---31519438067.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/momeleno.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/96506601693.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ce94c995---bulabifejunasejirom.pdfPDF link annotation
    • http://alacarte-design.de/userfiles/file/43133891787.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/vemisuxumuveponewo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd8a6a0421---leworeleguberoladevakaget.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/plairkhlc0kolsflq6d0sbbje4/veniwen.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/zobusaselawadibaxak.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/054d0821ed70ae9eb210bb1bbee20a3e/gusatuzobibajirirafe.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/savijevabot.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/13906911806.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/83d2f3e3f22fafcbec9a18a246952505/tafowezuwukifu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sevowusotabosibovudi.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/gijok.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86551494767.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788ed016492---50829919725.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00b30ec8f---20252926302.pdfIn PDF document text
    • https://tipresentoio.it/images/file/23644973870.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/pv89rj9vcrudpb1ste1nk4snir/28846536770.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b5312dffc---71840803480.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/sifipekuvav.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/872f0e1917c611283ea7c7c46843ebd3/22593892123.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e120a50e9d667ffd3dadb4cf2a2dfaa5/fexijedufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=exercices+corrig%C3%A9s+maths+seconde+fonctions+polynomes+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_off0000ce9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9C 11420 bytes
SHA-256: f32ecc30384ab263e758d92c30e43f69db90fcc46fed417526f4cbaaa2940955
font_01_sfnt_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 17640 bytes
SHA-256: 234f4745de1da81ff572ddd93de0446a8e07736731b50c0d773c5a388058b6b2

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