Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1677a320929d3d…

MALICIOUS

PDF

84.6 KB Created: 2021-07-04 02:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca8cf3df6184778002472080e0581d8a SHA-1: ebe9b4d0a2e87ac2ea0f17376501517529748838 SHA-256: 8b1677a320929d3dc86e177eb12ee03ed09aeb4a85686922eff1cfd4b1c76693
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/kurekivewezutekarisise.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/2s4rvtn73blg3bu0pa7df2h73c/ritedati.pdf
    • http://iltorg.ru/upload/file/xuxavawixajulul.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606fdfbda5372---23803066645.pdf
    • http://sity-luxe.ru/userfiles/file/53874108885.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/notatadetugonijut.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef1bea9547---75964028180.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb659ca330---beluv.pdf
    • http://skogsformedling.se/bilder_umeny/File/numorixarexugavi.pdf
    • http://say-international.eu/userfiles/file/97349983585.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/cc219bff76a7bab6e0092bd5036fb320/zarox.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jubujuwawijizaz.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/41968251577.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c99a7b2b0---69966400171.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/lhgjlh291213tj8bfmbppup457/kanomobatewazoj.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af710d4de6f---novixufirili.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/lawunukov.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/bimasiweropedomikaj.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160976dccdf359---kowiparemuse.pdf
    • https://xo-sound.ru/userfiles/file/ripodapijaviguker.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vsk69bjdc4ihvffnc9458rblar/56084805607.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927cfb2e49c---sifosam.pdf
    • http://lookkorea.net/userfiles/file/99282259919.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b4c2ad70---zimejuvemup.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/k9cnf1r8mml9o1a0ssu6upg1o4/zojanulapig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=solid+papillary+carcinoma+treatment
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 16792 bytes
font_01_sfnt_off00010004.bin
85d21ea9ea0f8a6f7a9cb92f7cd30c1087cd07410595b0a6b5e8a0e500c9dce7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 10696 bytes
font_02_sfnt_off0001188e.bin
3bd2690fbcc604dfdea99dace4638995869d6c70272828d5bd877ccc33691594
pdf-font-stream PDF embedded font (sfnt) at offset 0x1188E 17108 bytes