Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cb80a921ea997d…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 05:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17e611000a54ff8246138d5ab50dfe0f SHA-1: 4b1cddae1d59f10a704b74ae137dd6ede54b7430 SHA-256: f4cb80a921ea997d5755ac267549239ac15abdb48f44f0a1095758ccb0027987
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0ae6d309bd74255e6e0fea78812489a6/95520086552.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74f566881---topapel.pdfIn PDF document text
    • http://centromp.it/userfiles/files/golilu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328f2623814---wisipasoduzonadunanado.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/11163672710.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161367a0fd1f4c---dusaxopiguburojinojenakaf.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/63569710113.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5a528849---nipazovumizuxalekori.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84b68d768---82654613438.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/8037489479.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/rexulidoxeziruvamijowufo.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/kurezuvizefivo.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/tapizuxinodigusex.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/zilutezumo.pdfIn PDF document text
    • http://kechengchem.com/upload/files/muxuwiv.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/98334478263.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9hai5428hl8q1vlc8deouus05a/21621870582.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/44971758757.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/baxukikaxuzisubevilaz.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdaf3f878---topedizorufikokoloj.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/wopub.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/vimamuzasudiwubafalugir.pdfIn PDF document text
    • https://cartolmania.it/file/73844533300.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/gefofegeduruja.pdfIn PDF document text
    • https://angem.fr/userfiles/file/tolitexizefalurarek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kangal+neeye+mp4+video+song+free+downloadPDF 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_off0000bbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEA 11080 bytes
SHA-256: 2672552ba69ddbb2e4625933396c61df00983941768e4ac628a3861f488bc37a
font_01_sfnt_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 16684 bytes
SHA-256: 5e1118a83e46e93e0a9b290048ee5e97a681aa19e08658dd56643a1bd39528d8
font_02_sfnt_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1