Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8306844d238c31…

MALICIOUS

PDF

61.3 KB Created: 2021-05-13 06:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52a3a752d4123e36798c1ee072b2ec68 SHA-1: 478c125e44d47da4e6d5ac315d319f93f32f4ef1 SHA-256: 1e8306844d238c31499fbc5d141a59b562458f282ab2e9531c28c5de07fea4b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

Heuristics 5

  • 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
  • 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://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf421948be---tobanawus.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3c7c27684---tanufemavaf.pdf
    • http://alimentosldm.com/userfiles/file/sadolomiterevoja.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608979a9cb734---zusoletapegajofagiv.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c2cb400cf99bd0439ce82bcc16b218f5/40312028210.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/cc2ad950945f016a3d31a2ea5bc6933c/xafowapixegebobumududis.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079403ac963a---rufubagurulukukasefufipo.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160710c395e47d---ropopamesuvekelukoz.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489f1a2ec1---simipefajegomutob.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893ceb25438---juvorepupajofo.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rvq02488ub3hjbkltmcu8n1jc4/73754757238.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/6cc26897080a955c20dff3442c1b97e6/retivivuzapukepizeguvuvo.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4f8f2ea86e04a7bbbc455f78458af4e9/37260501908.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/01a120f7db7f2096aeba8522f59b9cbd/82825946537.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92be6f6ca---93852766102.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qkn17ds40160r526l473lf7a9/fodemixim.pdf
    • http://amandatravel.com/userfiles/file/japaroratovapesoxep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sintomas+de+baja+autoestima+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ca.bin
08addfb7e872bff96ce75445cb219a30373abdbe9c0b65f93b6d6f8147fe7c9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 5380 bytes

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