Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7f6cae8762810e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 10:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc202ea9cdb303088d5a53580b9af3a4 SHA-1: 134434181de8ce52717fae5308c7d929bbdf5852 SHA-256: 9a7f6cae8762810ef49d31967b1c6fa2c07442483e3ded91cf15c0164da6fe84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://broadgatecapital.com/userfiles/file/54458741294.pdf In PDF document text
    • https://robert-zauer.cz/userfiles/file/zivijaniror.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/3311589230.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5421a46fd---21587042865.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/14421188308.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/690f2984inpllfm0vvedmlchp3/31008541044.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/7783834391.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e47f0bc1d5864adb7c3519bd32987590/tisinanevudizerizukalom.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/pruopb7rf8cr95c9ctamv9muon/70474344969.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e338bc9d592---kexegebowevub.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/75088903492.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/povedisatuveboburolut.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/vaxuwizotodusudo.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/visonemafubiva.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/26965316179.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01cf337c3de94b70c16c683bd51719bb/lawekomunutefe.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/legabomipugexuvix.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/fajasa.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/53332442196.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076e083724a0---fagelofuduxazik.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f43ad9ff---92336290752.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/79695908074.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/79482320355.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/97180721539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=philips+air+fryer+manual+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_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 10760 bytes
SHA-256: 0ef6cf4b2dd8e5680112550df821712fe74967b1103b4e381541c5935f18a30b
font_01_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 17820 bytes
SHA-256: 856d224a2c598e8eaae281e90452492618e830a59016313ce67da817db11eb5b
font_02_sfnt_off00013394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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