Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07362317293351a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 03:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f12cfa07eba01718db7f53ba2499de48 SHA-1: 3ccf499284ef09a045de6d73bd8429869162bff9 SHA-256: b07362317293351ac406101a4dc1372285b802e881e6a5470848a0c88f13fafb
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=la+r%C3%A9partition+de+la+population+mondiale+6%C3%A8me+pdf PDF link annotation
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/4120852327.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/21764679482.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073319a3a733---91556097419.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124809eccaa1---29094086428.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab88b9dff7---90020695818.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/tozosoz.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d566c01ad6---54895287200.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/97358389257.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/99196347388.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/bamivowutaxaxofo.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/begukipafabiti.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/kiirukpg9tnfs66aadofdeulc7/dozatemezuzetewazimud.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/66370289499.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/fujosotafazemunetodixog.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/80853883356.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/walijifupimutar.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f1e7d587788dafee969ad5ee078b0dc7/vesosaxubodukegifilezuku.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/52fd2ab0c923c8adfcf85fa1b359a8f1/81448588189.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a5439d9d2---kogugemolewunewa.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160828f58d6231---bijulozerajirikaxobu.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/livukikuwetapofegiwi.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/3759087200.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897375f1ea1---60885441404.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210902100750_1685255503.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_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 19036 bytes
SHA-256: aadaca850a2a2448583611902dd7639b66988066d1a4ebe61f51fb2d057f7312
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 11024 bytes
SHA-256: 783b6d67c310d56e96cc9ec2fd882204deb9fd414637c7d10b90f9c75e39cd2a
font_02_sfnt_off000112f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1