Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3256804fa3af4a1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 03:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28f5667cba1b8dbe245d165a6ec78d2a SHA-1: f2ea41931ae0b0e4384f90e38d0f8c086d07a6ab SHA-256: d3256804fa3af4a169048859e77ed1f4d225ce171a8cbcb4b4f18c230ef30f6c
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 ML classifier and ClamAV. It functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links on disposable or potentially compromised hosting suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.prunay-en-yvelines.fr/ckfinder/userfiles/files/remevidolobezufetalozax.pdf In PDF document text
    • https://vieclamday.com/userfiles/file/fulogarux.pdfIn PDF document text
    • https://vzglavniki.net/data/file/45814410436.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd09b97b13---mumutudurixuvisofuzo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2po4o4dr1t51s6ff5poe97eke4/nawev.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/22731962626.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210511175709021.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/sewupidug.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6814836d38fede875705b58585822cda/78270487841.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/zaxakazexokogiriva.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/gededoku.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/80272410822.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/tumajavaninuvote.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/mozujesidoro.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/lowinofezigudosanuti.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/40264411085.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb8f16a64---37717266279.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pagupomevamodogedid.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/38239293399.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f87737cec51df86fbafc2ffe15311f6f/xifawovanibujosivawimemi.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/24011579339.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5b160720023758399e15bc169264dc67/94121933246.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/36215675705.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///pixetavixasanisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=samaritan+woman+sermon+pdfPDF 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_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 17424 bytes
SHA-256: c9e677dbd1dfd3b78f45791a2fa637d6d620221421b93af843fdaa18ace3da6a
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 10776 bytes
SHA-256: 8276e02a1f14af1c947855d59d455d9f6452097e3b8c73ef796cc6900b0991e0
font_02_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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