Malicious PDF — malware analysis report

Static analysis result for SHA-256 458dbc836c3896f2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 05:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9946d25a5ec3df1479f166600fd5bf2f SHA-1: acf55465349ed658a781a0d793d718caa4146ec5 SHA-256: 458dbc836c3896f257e612a854e1b99b7d719c3ca99951a741d970885ab25f60
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to potentially compromised websites and disposable hosting, indicating a link farm or phishing lure. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/40081f0dbdefe1a4000274a22942cdc7/nifopasuzidape.pdf In PDF document text
    • http://greatnice.club/updatefiles/file/86073499898.pdfIn PDF document text
    • http://labradory.pl/file/kafepukarevoxixapuzamipof.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86e4e16b7b---wivopud.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kebebuwulufusa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e147711a---difitamatir.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/musapepa.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08fed512f---vekopunakuja.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb5c8176b---rukevobexirixamafubotoxes.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210808011602.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/88081513368.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/zofowilodadibovuliw.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/lifebonizanujopifokok.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/bekotivolikolirexiwor.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/napeponajamepudinozina.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/suxafolopeki.pdfIn PDF document text
    • http://homeopathyhk.com/files/guravemesedaxonurugifemi.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/46196571600.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/talojo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/97684453477.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e2209604db07b68a27e460a625e5d825/80382526688.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pujirasafuxatiritibik.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/zovapomosefolofuponepatod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=old+advertising+jinglesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe6d3e9b5---66528006838.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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 10524 bytes
SHA-256: 34a9d4bbf83cf32e31d20e3abe5f29c47381e765f32e048bdc3d2ae72db94523
font_02_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 18432 bytes
SHA-256: 1014494384b4a54d36a98380c3c5bb67e22ac20da2e98265c8b170c1d39d9e02

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