Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ce867412da4e6c…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 01:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ace0592e81db855a15f0af1bb62975ab SHA-1: 271d09cb2a338eabfded863b58d89ee25d49cb0f SHA-256: 18ce867412da4e6cda690052603f9e52e992d15d591b6885e29cb2728c2dc77e
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 ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve to manipulate search engine results or direct users to malicious content, consistent with a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9701c264---degepaduxiri.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d4753e52a507217639bf10b0a73c057f/kewazawoboxiga.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/672nkfmhrf39mrenub2f3g2spa/wawujugoka.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e10325639d---45722364854.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/21725066667.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/55767822155.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/63fb732c46c1822a57773741ea6ae886/40309007889.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/51298801649.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/jazugezoledewowujif.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/56398187967.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rs44iabaed15pe7r6e3r0cpma0/62468153510.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd0707b8b3---zijigu.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/98496336745.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/nipiximusisokiwu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c1a5f4d5c6c15fa4f51c60289f9d734d/23356969791.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kumugaxanabetakibawa.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/zuxew.pdfIn PDF document text
    • http://hzqzg.com/d/files/tutarulixibuwuripatovuwe.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/varuni.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b03de34d---mimiwuniterudubaxejaz.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7c81ef00f00f3b8cf3d79e51fec6516f/vajudib.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/1efb74573b486ffb99e001873eda8f42/vumonel.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dcc096ac7---givatukuzejujewogevevon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+sniper+in+ghost+recon+breakpointPDF 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_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 17032 bytes
SHA-256: 1d65a2d5f7563c93a3dd4a5810fcfcfefcc4e6428a9d5ad6cc38aa60498e1d92
font_01_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 10892 bytes
SHA-256: 50488b358de8d0e7b69d31dc49cfaff4dd72cf2121eee6d09f2828de53ffec89
font_02_sfnt_off00013677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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