Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e3924eb8279e27…

MALICIOUS

PDF

76.4 KB Created: 2021-09-15 18:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de1e2b0287205f182b092bd26a375c7a SHA-1: 9338d061c17008970bb31efb4aa60501ba071048 SHA-256: d9e3924eb8279e27ec2eb4f0d6e7277d4322b60035efce8a63138acfafef8944
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing pages or malware downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, with many distinct hosts and UTM parameters suggesting a campaign to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=d%26d+4e+eberron+player%27s+guide+pdf PDF link annotation
    • https://vgi-vn.vn/app/webroot/img/files/76665887257.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/sonabejef.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/37895512511.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/94752861853.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5e34bb0b38950caf8d76e0f2bc233cf6/40842011520.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/65164987940.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/67120992780.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/liwedot.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/10689441685.pdfIn PDF document text
    • http://sro52.ru/uploads/files/ririmuxepifamegizibav.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c9e6d6a9---niwaxosexulitusawotokexe.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/21814611623.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/libohmncsf01fetqa0dq9qq1ak/37874198112.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/3770473524.pdfIn PDF document text
    • http://space-edge.com/upload/files/1857097036.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/43702598794.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/xagifejubi.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/bazuxuranupepuxag.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/bepawesimuzuvazavimot.pdfIn PDF document text
    • http://orderkai.com/uploads/files/vapafufibapexelizevedoju.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/19287915317.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec8dfbdb91---53617014035.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/takubidusogigid.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_off0000c138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC138 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 22208 bytes
SHA-256: 08464514f0af94e8aef07c33119fd96f19e36f9ad0b82fdce78ab593df04de34
font_02_sfnt_off00010cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1