Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecc18750533b2d2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 13:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 925d7f87ee9bbb3606cc8cfd9853d063 SHA-1: 94a352db8701f03f90bb1c891cf932e8e80668dd SHA-256: 6ecc18750533b2d212bf5efde0ddbf80946beb903d61be52a96f3f1dd5c86196
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS installations. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de7941e55d0---20775604464.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f02e13b89---sobelozuro.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/87711653007.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/50714480120.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079191422f06---1580917547.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/62691523319.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160871227f04b9---10713964275.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c425822f815---73727660008.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/rureganibijokonapit.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/tosapurobokumepozor.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/jolowejobu.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/xopuriladitadib.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/10125846709.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/8966802517.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/lafosezuri.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/zebejelomapawuzutuj.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b67a8634---88065762999.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bac97deacef---loduzenikoxodu.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/88649330516.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce0693984---88961020096.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16294326552351.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ee0e5899e6f927090fd6b2184481621b/87861391705.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210605194700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rhcsa+rhce+book+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3457ec162caae244cd0f1fccbc95b05f/99353254695.pdfIn PDF document text
    • 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_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 10652 bytes
SHA-256: e12b70f05f3df4c6ecef32523804e3b86354bc8095443dbe14fcf92dc1006331
font_02_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 19160 bytes
SHA-256: 558aa715b96b9526a1e96f16558561b9e66c5c87ef51881545568f8367b03c05

Open this report in the interactive analyzer, or submit your own file for analysis.