Malicious PDF — malware analysis report

Static analysis result for SHA-256 b930f5a0ff421b46…

MALICIOUS

PDF

102.3 KB Created: 2021-09-04 02:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aec2b5a7e13ea4ae4f4bb02343e07bb7 SHA-1: 8c395aefa30a3711d731196354aa766603ece0e2 SHA-256: b930f5a0ff421b464d760957d11946fffe12420ceb6700d0e922ec274fb9632b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm or hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The embedded URLs suggest the document is designed to redirect users to potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://queure.ru/uplcv?utm_term=bridges+in+mathematics+grade+5+home+connections+answer+key+pdf PDF link annotation
    • http://epmresearch.org/userfiles/files/falowexojikav.pdfIn PDF document text
    • https://angkalaris.com/contents//files/fuvipakalekaruvivekovuvo.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/62716365128af343953176bdfb39052a/xotabilonok.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f31b5bbc8---garesanolopasiwaredofulop.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160996519ef680---tonajajixidifabupeborazux.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/41909307604.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mhodhi8ga56v5tbcbtqbp6qq53/kufikekujalo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b01b21cb6ea---80852843704.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/felezava.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7b75b7a7338edfaecde5122cd1e1ceb0/21932877052.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/sofaxaxamodajuvupaw.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/44609512715.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/gukumipe.pdfIn PDF document text
    • https://latework.cz/soubory/69726480652.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/43486393992.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2ef704a446ea7fb0b487ababbe60c23f/kidukonajujazes.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/pavuwikez.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d5e153482020927a2f7a00ce712fde30/44077390666.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/9blmcsbocic84b8eckedoscs13/87886577251.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210630_0DFBB707653EED0B.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f5jpef1gd68mj2g7vi2n1022og/52317489519.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/vaxegunur.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vutomo.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2c8eebe96609619e480181dec85659a8/wabigidaxoluxerevokono.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_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 19280 bytes
SHA-256: 43affc3f6ff4d857670935b0beadc978039957bcdf327275ebc488fee0223f37
font_01_sfnt_off00015797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15797 11500 bytes
SHA-256: 2771c79401415a20a8ed1d8b3722e86c1caa1c56b8a0fcf6a389d465c41f717e
font_02_sfnt_off00017294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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