Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6fce5a8ed68d86…

MALICIOUS

PDF

106.0 KB Created: 2021-09-01 21:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8714623f2bef17546cdeb43a38da677 SHA-1: 351e7264de56e2f686137b460d7f0613a8d79c32 SHA-256: ff6fce5a8ed68d8609638acc57c8a9a987ae13dc4472a7906f6931ba18b2fc7c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content hosted on these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3ab54bee---14799115302.pdf In PDF document text
    • http://aliglobshop.com/userfiles/file/16222600452.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd2ccaddc3---faxadovuf.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/cbb7baa52e37f679486d5a1bfd9c9775/vamezonafeg.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pavefopusubuteb.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b523053af21---41506146900.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/mawamu.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/muzikiladujo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d7e56a3fafdfcd6727cc32ac1565ea71/25333698828.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/82044127995.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/tezajaremirusuz.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210602_212752_2693.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f33cdaf021---dukexofifolizexetejupabo.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/pivuk.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/57318930971.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/9f9744c80a2e55f1d2971af9d8ee8bce/87932585664.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/21246603911.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/fe40f707301b8bc59e82960688d5135f/67004416679.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/meritoniki.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430141833527031.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f3608e76c34---3596964134.pdfIn PDF document text
    • http://www.centralperdana.com/file/jodevikirizaniji.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32602c16e3---25295558983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=middle+way+meaningPDF 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_off00013297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 21816 bytes
SHA-256: e9437c1b224f1a2d6e9bd7665d678751dbf6c74f9d14188e2dc45ff67c083630
font_01_sfnt_off00016ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000182f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F1 10296 bytes
SHA-256: 3400f884e59d85951bf6bf04ef8667a7f69a970e3d0777c945760f2861477fb7

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