Malicious PDF — malware analysis report

Static analysis result for SHA-256 761ccfd9109e7ff0…

MALICIOUS

PDF

84.6 KB Created: 2021-08-26 01:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2da095832976b961b162f2b98633aa3b SHA-1: ef9b8007541d77a8630433ba621f72ed2d4bc691 SHA-256: 761ccfd9109e7ff06833bd2e0f0770f22b3ffc026eb7057c4309542bd2a85c3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/7sjv3cc5v88orlhr7tsajfasf8/61909699356.pdf In PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/71898057189.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a87c07997d---loxazidamulibusixerusu.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/90631496072.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092facdda020---vemusutoleruzepuwuler.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5aa81ad86---rozotefixegud.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1ebe4d39e4918177ca52692c93df982/70836551566.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/65169de3f641b7c27e887ea03353b2a0/zewogetifoxisuwa.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/jusojoxexevi.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/63512424042.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/papatenozirivibolopi.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071517052350.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/jodufogo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4563d9c161f3eeef374bef4afb5d06f8/55647646984.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4292b27c08febc1d7a40ca858ca68df1/gelorogugoxazofurorevera.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe34cb9fc7---tutixatewarexogo.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/xosanesedudewamew.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/65049331280.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d7739579d0faba38e37c3f9e3277e945/pavusagonarevisuk.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/33570373720.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k5m066lkbrvblko7j8gva5r6fe/peguwoxodemowebezuro.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f720702fc2759913a0a2f2fdca13497a/17398993635.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210712_EF2FC49D39075BF8.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/botabigiwalisabelidatam.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7fb013ca6---wimavixadunabaduzidozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=can+you+tell+me+about+yourself+interviewPDF 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_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 17392 bytes
SHA-256: 25ef111156168c622aa8d07a97aafd07957cbefc84693f78ffa6a2a480354b4e
font_01_sfnt_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 10912 bytes
SHA-256: edf2f78c731daaaae32514ccee5cf4051315d5f5eb192ff6298c3f92696bbe65
font_02_sfnt_off00012b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1