Malicious PDF — malware analysis report

Static analysis result for SHA-256 09810095fce3ceb7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 14:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b051866fe880331c09c96dbeeb34292 SHA-1: 0deab50cdb9a5e0a2e62def75e4765ee908e7d70 SHA-256: 09810095fce3ceb7ff4b65c9c95215952d86d3bb42d12a08b156f38cdcee256d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to potentially compromised WordPress sites or disposable hosting. This suggests the document is part of a link farm designed to redirect users to malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://partroyfuneralhome.com/partroy/assets/file/mujotokutiwumebozos.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e366073b1e---mefajadojiveze.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/44862118648.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/97003846590.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/73228324956.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/6350956948.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/87032977437.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/350c01be3141b8fdfe2734483af8cfe2/galenetevupuxevep.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e39cf22a---vututudetolunubuva.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/60831818944.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/xujakibiwiberigijerumijog.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/58332758003.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/bezituxefosoxajasuxigur.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/bominaxofexulapo.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/roludukinafu.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/latododotakopidinu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2b253fcf0b1a9a264a3d7b2f8609c7ce/kinajesumisatisul.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16083eebc723b3---gavof.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/danaremadekitewamita.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/87935500125.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/bukuwopedolatizovoratagug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=calculo+de+roldanas+e+polias+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_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 10648 bytes
SHA-256: 18e99dc198fdb8148dd09bf6b4d38b99b9460c9ba9b99fedea0e2e230f5003f4
font_01_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 21160 bytes
SHA-256: 1645c34ad2534dc657148418f1d69d72fc2c4e342f848ab95a6113b105c553e1
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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