Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27b3eef6ca0045e…

MALICIOUS

PDF

93.9 KB Created: 2021-08-03 15:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce5f262a16ba953ac7d6faf8c43a7b35 SHA-1: 2847983b6377216f1a155ed1b96931a389433299 SHA-256: e27b3eef6ca0045e77a99e4f22519a3cd77e29308e035848e7e43c205deaf270
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lead the user to a phishing site or a download for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/14837759177.pdf In PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/piwepujizivujabuvome.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdba029997---61989129257.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609907d27ec2e---97996749601.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/dujeleputiliwujop.pdfIn PDF document text
    • http://lblussana.it/images/file/52557851266.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/32681927360.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cac47dc5f86---27108916900.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/queoir05qnm0jln3e3k8m1ojak/najaj.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3a8369494cd2e98f11dd8937d800bb8e/ruruvinagus.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/87623240571.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4b4d3307---18421841418.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/77859192175.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/valadure.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/82buvsgp59go51l4tarr59irg0/jivujodotininipisoxijega.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90a5a8ad3---vebavazofanafomexivudaw.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6d90upkfsfjmpp6adbr0aevif2/zibamubefafojikuputiposoj.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/6kjlfolrudtvq84nv2pla5kv27/gukuzuruziwisifito.pdfIn PDF document text
    • https://kawanmto.net/contents//files/50341535950.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/23747035582.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/23590818851.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072aac24e745---tuligubiromuvosafuw.pdfIn PDF document text
    • http://edgecs.net/documents/tolimefunijitagojetixuj.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/gakubagosekekapoterira.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/s0apiorvdh0hfkqd42h40b1b11/bavanetetejorikufu.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/wozapibobirujokogajemuw.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0afe326eb---tibemikekewolazelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tabla+integrales+inmediatas+completa+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_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 17196 bytes
SHA-256: f499a87866a3ace3138355de116d5c4ecbc44686e9c8b088d88ebd8cb4117775
font_01_sfnt_off00013577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13577 11064 bytes
SHA-256: ae6402efdb36b7edd2a448075a5e263d6662a24c2800e93da61e13a717d2b3c8
font_02_sfnt_off00014ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1