Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b720b379896c46…

MALICIOUS

PDF

96.5 KB Created: 2021-08-12 12:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: eb28efe9883f0611d60943822cb009f9 SHA-1: c256681d1d7fda9e0bd6bba0e4f94f2e7999fb62 SHA-256: 90b720b379896c466494b42835f867af49b4e2351b409746f5481874a8e9c65c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and multiple external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or redirect users to malicious content. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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 http://turar-mussin.com/userfiles/File/91707832544.pdf In PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/83320539878.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/74839337706.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/20609770995.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ra0d6smfomo5h52g9fot37upap/pivemepoxutelunilijodenew.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/22702282210.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161146a97aec0f---87495185505.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/somibitumetoxilela.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9d27fbedf03207e54e7ef3dac5155dd3/8396767708.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/33281735952.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/4325660473.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/pugujobetawevavosiwuta.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/57501678618.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/16888202077.pdfIn PDF document text
    • http://sdes.in/uploads/82970851477.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6b0c6cf88---32365258727.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/qpleur3f95u9s82dum675ah1c4/jinibokadapox.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105420a38c2b---95125781856.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/pafuzibuzupozuji.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/pimutewanidewarolu.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/rosulid.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/jusevokadosagizijo.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/pixelunuvajum.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f37f08b71---61984430845.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/digedurog.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/89244223378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ejercicios+de+razonamiento+logico+matematico+para+primaria+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 11136 bytes
SHA-256: ae53ba744b2bb0b2b4acbbd24c76a6e99ac91745bca75660dc122d842e1572b6
font_01_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 19828 bytes
SHA-256: 3d668d82de878f5dc5c07b5377393c182fbb1a624722daea65469ae3e1bd909c
font_02_sfnt_off00014403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14403 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_03_sfnt_off00015923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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