Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4f3ae7aca09c81…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 22:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 121169d22e266e1d8c7d0b5168f0be7a SHA-1: 0ef5298eb647f0553fd32107486b97a72122e8bf SHA-256: ac4f3ae7aca09c81fe2d205a6df3c0a4cfa743bd45606d0b94364d162075db79
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. These links likely serve as redirects to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://clubselectionvoyages.com/images/file/68366503182.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d90dd44ba---93401973559.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c756e0e11b5---somafodixerizokanezanagav.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/fepazitojofopomoburegivup.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/28633221910.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/safojatirodudo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e42ca6f2ac2---19006254447.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ffbf862fd12---mukogasefevuxeputonipaj.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/sosiwinopugukonukoveru.pdfIn PDF document text
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/8d29a051ccf843a99ac1668bd98a3767/63655586782.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/silurafemopewabu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca503cc42---gutedojovuf.pdfIn PDF document text
    • http://raczcsalad.hu/files/lobedepadinibax.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/dozugasebuvopufo.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/33754764161.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/90f1d005ff0ab45181b00b9cb4e05021/95027077269.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/47039114525.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b26efe81de3---80395189115.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebcf0e89c---10512813084.pdfIn PDF document text
    • http://christopherdallo.com/file/53343946954.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/davanavoroxima.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/73531877337.pdfIn PDF document text
    • http://favourtec.com/attachment/file/xavolipusoxipoj.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lezopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mccloskey+s190+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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 20200 bytes
SHA-256: fca7b1d8bd5a868cae56cad31790924b0042ebe3cc0dce9bcdf1aba7371cfe75
font_02_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 10600 bytes
SHA-256: a7c777493e8a170ec159bc00829a5fcf20f02ad35eee2202bba26921646d82ad