Malicious PDF — malware analysis report

Static analysis result for SHA-256 7300437d5b48e517…

MALICIOUS

PDF

88.8 KB Created: 2021-09-03 13:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3719c3618b94e93135f83245efbe8586 SHA-1: 49438ff4d62a973f089680745e76a303c4d4301e SHA-256: 7300437d5b48e517e84f1f918488f6daed15894f481302650b104d99cbf2affb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b5a39a04---gazadili.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e02933d4d0---sokirazu.pdfIn PDF document text
    • http://ktcz.eu/files/files/11635750133.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aca159bd881---74454498267.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/6156185974.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/lorasupugogemanu.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/kupitaxulivekijadowozoli.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/35804a71cfdf1b727559b76611f51c39/78867228968.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/jaxerexuk.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/73085490970.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/zabinatefizisub.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/pixemedolunup.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/53247852630.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c871b3f3ee5---21468496871.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/rerikuxugidesobalufixosez.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/a4dacdbb43e365249995a5fc522a5675/kugub.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/buxapotuj.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e8673c36---wajujerarovajasuzuvopetid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b265500cc---71593451254.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c7c5eba86---41855222874.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/sibebevelodepu.pdfIn PDF document text
    • http://veivel.com/userfiles/file/basagamewejokawinilifozi.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/28805018809.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/pegozipufeb.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/nj66o1ov02poc5grtqj6d38m94/kubatowajopunuwuregawow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ugc+net+answer+key+dec+2014+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_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 18372 bytes
SHA-256: 128545d49af12fb90fe28f099eb9c06c86f108999a149504284acbc1799c61af
font_01_sfnt_off000122b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 11208 bytes
SHA-256: a86ff76a83e579afb77dbbd4a57c468bf610c0298de42de3debb769bd73a891a
font_02_sfnt_off00013d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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