Malicious PDF — malware analysis report

Static analysis result for SHA-256 41be249b0c58cc53…

MALICIOUS

PDF

71.6 KB Created: 2021-07-13 13:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e5404e4de047a2208312967f4ae4950 SHA-1: e88cdcbb838b35717d6daa224c8fca495b8f3404 SHA-256: 41be249b0c58cc5308340f66b8d9c369240aeeae14626dd38ab36d5e7d86470e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The presence of embedded URLs and the overall structure suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/28c0880c644ce200df3e6953f4fdd124/kumagegugu.pdf In PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/14751086066.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/m6f2lp3skdiehugmr2f7f721ls/57079224132.pdfIn PDF document text
    • https://jobtiara.com/files/files/todilenonudediwux.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160822df452d4b---zabap.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076929a80c29---xexokipafikunoso.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a80e19991a70db73bf64a58428bd2ab7/76455285618.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4927c0b00364094d827144d8bf57feb4/zafoxebifa.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/76039415350.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/22626230193.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210528001455.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/vekewitigosiwenig.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c0621ffcc0b87e7abec4787b437e6b40/30572702201.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/gejedovesewuliju.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sbdethrpjfgao9juc73ronb550/4926808637.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/v3n1dkuqeic15ntmhkjg87kaur/toruk.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a9062640---kilelexezewemusaxadaletuv.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/tebolu.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/56443384760.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/89906623642.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6bfadcc7---taborigularivomewazadipo.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/kenexataxamuxe.pdfIn PDF document text
    • http://gibisch.biz/files/files/68769148060.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lkebsoddm25ntvj8mp6bpfhbu9/77214422239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=austin+and+ally+you+can+come+to+mePDF 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_off0000b985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB985 10628 bytes
SHA-256: 550a8bb007ee5fff70581161be979eaf625e02620b0d471e723325f90938f1f0
font_01_sfnt_off0000d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 15380 bytes
SHA-256: 9d0e8675b9fcf30303f1bd2ba7c4130bf851a5828a96c0e87522d61d463088cf
font_02_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1