Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18f1e0c5c6a8e1f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 21:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: edbe683f4a43e2dc7c36320be99c748c SHA-1: 980d158b0a34e19025716bbe580a3b17dc858baf SHA-256: e18f1e0c5c6a8e1f95110dc4bc0742b09bc0b740edf6321ed8355ff859e6d6c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=problemas+resueltos+de+funciones+exponenciales+y+logaritmicas+pdf PDF link annotation
    • http://gabinetortodontyczny.eu/userfiles/file/nativiwemozedadet.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/442922384.pdfIn PDF document text
    • https://harom.ro/files/file/zasiledu.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/vuramupumekipobufu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160876cc542661---19452177088.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cebbc1bc874---regilivumedirojugi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae30c40e0cf---zebekusatakiriladob.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/v943rkd545mo1ai5meairlj5p3/29791533264.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/87cab2eca34462a00c24211bfdb575e8/75906500713.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/99415879758.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/parapidekede.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097d0e987721---98449293917.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/78062577800.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71405e7f4---levigilodapokotaso.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vulikorajonifugexesutaj.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/sufugonuziwabufarusokona.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e902eee2175---51748629859.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/musasovagujar.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/mipek.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/wipixorekinato.pdfIn PDF document text
    • http://dges.in/userfiles/file/98911251531.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210807121946_1857851674.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a677426f523---38054617723.pdfIn PDF document text
    • https://blugarden.eu/file/37408074543.pdfIn PDF document text
    • 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_off0000bdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB5 11420 bytes
SHA-256: 84176be314f9212dd42a4e068bfbb8a551b305eff0c96d5c70804988dc8bfa29
font_01_sfnt_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 16652 bytes
SHA-256: 1403663f736ed9d9cce2d30a46d89469b2a4f65b316ac1f7323193efa125f173
font_02_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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