Malicious PDF — malware analysis report

Static analysis result for SHA-256 6790d6860df349f2…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 22:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac7c092a96f401234539cd31b53f9ad6 SHA-1: 58b58c11e2fe31d5b334d0324b277d050787f856 SHA-256: 6790d6860df349f2ffc37eb6bff62867bf7499f14d66b7755e1a7fa28cf31a02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious files or phishing pages. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/4811gtps2otgqb0pagjd73g3kb/82246720881.pdf In PDF document text
    • http://comlark.ru/userfiles/files/kadegaligipalalubuza.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5a4effb8---57259717967.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/xepizetirukaxolo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a09206f6---xuferar.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/gupitiguvutijejeninamajot.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/40218164064.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb787cb6c---denifavosabaradigaxagi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fe03beef---zotemuxoxavadigufasa.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab59e63d3c3---43293708675.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/j82umiblaks2og3sqbdt746a6r/40904894933.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/71084982051.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160acb4b306808---nowimulesijazas.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/najaxomoziwub.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107012226232721.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/sojuforozokurifameruxaj.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/14416366910.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/dilurujuxarikasiwibu.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/46060620655.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/begowiwomedolikosunegup.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/55425056586.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/968ec69b4b957f02cadc52ebee57c539/17551967343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=reliance+mutual+fund+sip+cancellation+form+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1cc36a2c67cfe7e05db66f03c57be1ea/dateputurel.pdfIn PDF document text
    • 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_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 16532 bytes
SHA-256: 66031287b71ea764a0779eec2bc7bef46f1a8942a476b3bade7cc5f8222a8f1b
font_01_sfnt_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 10928 bytes
SHA-256: 38436eb8df26f7854665d180b7570b52e06f5e1a6b93c34268934a834a248190