Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa815b5c66dc1305…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 11:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d80ab8d48f47a2263be9e761072256c8 SHA-1: 072777648b7a4a38b608f4b1f36a66aad85e1aa4 SHA-256: fa815b5c66dc1305fa73b673a1d97975cd96866bcbcb01b1bfd3ef88e3b5200e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://energo-winstal.pl/userfiles/file/fupubigo.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7cd100ed5---bedetadaputaxebe.pdfIn PDF document text
    • https://priscar.com/documents/files/83121473057.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/valakiwitobogoregedo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/85e2j48sp57mlelfj77b6mqg0e/kokonewutelamunejiwuvub.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/runizirejewux.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0b30d18ca8a7debca5532c7df7ac8031/mexodijubibowoge.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c895a06fda2---kezamosidivozotiv.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108180941348369.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/kepivufoduvujisejibijo.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceae6e51ba---nufibimilozalitubuzuzibu.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/tipunokunexukome.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/xigamirimolalubadopeta.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd0d74121---5213032232.pdfIn PDF document text
    • http://peak-experience-japan.com/2054238010.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/duwemadubuzakaz.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/vozemig.pdfIn PDF document text
    • http://healthywithhart.com/res/file/18338748932.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b269efce2f0ea2e34771a8390099ceb4/lonuvawufer.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/gefolozomikoduzovelako.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sebegavujiwufizidomifalu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/mirodadiku.pdfIn PDF document text
    • http://acril.ru/ufiles/files/robokuk.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0fsbutqfu21gdpjbvhvioq2s66/81412585977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=my+dog+got+her+period+for+the+first+timePDF 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_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 10740 bytes
SHA-256: 496c78230b2dec05e0b69eea3848589a4aabc41ec4d8d553653606c565b555fa
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 16788 bytes
SHA-256: 77e4c1693cf6a8f3f1411f1261d1e423117488fc31ea4406c3bd0e14e5674cc0
font_02_sfnt_off000115c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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