Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87785cded2d43ff…

MALICIOUS

PDF

79.3 KB Created: 2021-10-09 16:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d93cd97c4ff9f36330cbb3061ae30a0c SHA-1: d25744e58338923017fae9c0963aae658140f4ac SHA-256: f87785cded2d43ff1eaaf7c9f9b11685a370f2472a27e21dc78f0e0b0fc2410a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to trick users into downloading further malware. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/duxafulisovezupamokona.pdf In PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/63897151338.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/37373544779.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/90534468082.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/sopidudosalenalufoxokika.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109030452072134.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/mepupuxisixejejazipet.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/xafuzomemalazir.pdfIn PDF document text
    • http://askort.pl/Upload/file/nujigagejurajifibanofosi.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sogebunorev.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210915233209.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/88580324514.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1616112d1149be---55940716396.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/votilaki.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/97567428435.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161558a37b910c---xapumaxoponakotupug.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/kijewogulum.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/daf9aff5318fb8e5a9af66a5462ff58e/dizezoropafekumamuz.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/83623369165.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/11001499159.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/wepomoxanokowavolifofawe.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/gamomudobaxadelefafimovux.pdfIn PDF document text
    • https://cartolmania.it/file/zikepovixo.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/topidatipezuken.pdfIn PDF document text
    • https://foulardfotografando.it/file/36320201714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kgf+chapter+2+full+movie+online+freePDF 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_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 11036 bytes
SHA-256: cb58fc910f65af13a37eb4328eb977386240bed378f4f9b8e6e69e8c16a75ba4
font_01_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 19176 bytes
SHA-256: d9583a1eaef1515135f3bbc91c17bf4a9c34e0865a3454864ac6a7c020355f23