Malicious PDF — malware analysis report

Static analysis result for SHA-256 11165d7b829c46e1…

MALICIOUS

PDF

73.4 KB Created: 2021-08-27 17:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 938b8a1d24a14446adc098e1fac6b6ba SHA-1: 3fbb40593df71ba86c6bcd23c2e0d1a70acae6d3 SHA-256: 11165d7b829c46e17551028dd0ceb013cdf18ec46fdfd735d8c80a9239dcb323
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with critical heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The PDF likely uses JavaScript to execute malicious actions and redirects users through a series of links, some hosted on disposable domains, to obscure the final destination, which could be a phishing page or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89309175762.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fecf6b2841---fataxinazojut.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/sukefetusezikiwijimegu.pdfIn PDF document text
    • http://honda-vo.com/upload/file/3404810979.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082859b8f671---62757112094.pdfIn PDF document text
    • https://clinicaveterinariacabianca.it/file/33310030618.pdfIn PDF document text
    • http://4bx.pl/public/file/detavit.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc76ed25c5---nanabigejuwegenukif.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/86712921028.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/vadatogotikonubex.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7d203e5f8e9370184e0891b177c570a0/13292464121.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/nurovuzogelodifiw.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ed5bde2ac2545007edabef8871e8ea24/gujoxaworunawaxibalo.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e83a009ef8cecb7a0a98088466bffb86/pegotimerokapusibe.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/tepupubazepubafopezop.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/24626119357.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/1df37817be5d3ba61370ed08256d0d19/79087962609.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/58854484097.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/e86d1cd63daa6f8ef560aa5b71658e19/tutevewa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/48688046591.pdfIn PDF document text
    • http://camwater.org/media/files/97394109275.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608774401ded9---xojexiligosudobomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=do+employers+care+about+gpaPDF 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_off0000be86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 10876 bytes
SHA-256: 4960252bf27ed7a1eb3332a8f58024ee15ce76255b234c363772f4ebad3cac7d
font_02_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 15688 bytes
SHA-256: 2dda1f7f0f026f93fb62183b95bf7d786596840e3046ad4d0b85b5154f1e4a6c

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