Malicious PDF — malware analysis report

Static analysis result for SHA-256 e14b26aa44669db1…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 12:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 938c8485cfac76937dcf82f24b05d00f SHA-1: 34f7964329a5d9bcaf521277d9a2ed14c6fd3a0d SHA-256: e14b26aa44669db1accc39c46f9c56d9e9b319d1b110978ab6496318cebe4ac4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, with many pointing to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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
  • 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://inverpalmas.com/aym_image/files/gutololaxuxadojimof.pdf In PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131930ace678---44245556994.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/guvewumulesod.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/zodupin.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/japubo.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/luvilalanoti.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/9f10573e5a4769c5cce4d0ac85933ad2/88094176268.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/92659160509.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/lokalanufikegavewum.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/sazapa.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/43553592204.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/giwunetusokikag.pdfIn PDF document text
    • http://ceroki.com/image/files/33232826461.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/fopozigonatodupusobos.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/68833059145.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/zokasedonigadivifo.pdfIn PDF document text
    • https://webhosting4.net/media/file/29996236914.pdfIn PDF document text
    • http://hueide.com/upload/files/99303023703.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/girupubezagetivazufen.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/27382224523.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/51059361096.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614916a9e7a82---42469935150.pdfIn PDF document text
    • http://net-marketing.hu/images/files/dafinutovotupenod.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1072d8e1e---10929843482.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/rusetizuzevofev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+take+pdf+on+iphonePDF 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_off0000bcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF4 16736 bytes
SHA-256: af85b0aed1704cb80e54cab26137294a99c60375f5422c3bdc1f9bb401b248ac
font_01_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 10448 bytes
SHA-256: 35cbac4dab27ecbe36dcb35c831e7ef6c14f6359e5a1a1e6db2e0d9cdd625232
font_02_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1