Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d0a94030910362…

MALICIOUS

PDF

86.7 KB Created: 2021-07-17 04:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 93c6a9b1d86851fef921b74a92d84d87 SHA-1: 0538d1e9e66b7ab6dfb5cebece9e81b3c3a8d3a5 SHA-256: 90d0a94030910362ae091a25513d3c2ee2deaf23f07e2bb9d455d78e9c68f37b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous external links hosted on potentially compromised infrastructure is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9u08gqq62477srqtsthvla39a1/sinajilupedimepod.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160752d819d838---nunujesifobizofipo.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/24799171752.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210708_4F8B7CC20DFCBE2A.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/87964352484.pdfIn PDF document text
    • https://kopari.hu/files/file/kabakojekurofujexewufopol.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ca187ae4---xawilezabos.pdfIn PDF document text
    • https://vieclamit24h.net/upload/files/dogozasiwuvugarikazim.pdfIn PDF document text
    • http://debden.org/userfiles/file/64114089600.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0996ad4f---rojipipituv.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/fuxifosofij.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/58238828027.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/31683428436.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/81g87f7lvvvrvicsoh7kfn6kqm/kavalomebezevo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b86cd6a88---sopavudinopepewimezesada.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/01ce9455f6b27a1134ada40b7186918e/bagobuneli.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f74bc743a6e39121f145e3266a59bede/fabanubomupilu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c53a4f97592---bonogunisesimo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/g924lucjcp392m8lkbid6v3mao/86352432957.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/timesisumineto.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081813e920a7---ripezumofojodevuxuwebotus.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/b885293265ca67ff04c48b675bfba976.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/gobanejonejugilirewemod.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607748c6e9c88---61064162769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vesicles+and+papulesPDF 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_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 16936 bytes
SHA-256: a8518c035f64ec024d950b67527e87b9b7440aa06340b9a4418cd2d385032ca1
font_01_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 10256 bytes
SHA-256: e32ac8c41bc90920ba5749d7a58a6387191e3cbf463e8085132a0c049aa43a30
font_02_sfnt_off000135ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1