Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da79290955ae564…

MALICIOUS

PDF

69.9 KB Created: 2021-06-05 14:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ab14d17036b3dcdb9c8127ed22e3a898 SHA-1: 540d15e40b7c441d2a9d6267cfca3dce2091fd67 SHA-256: 3da79290955ae564ccaf194c596b484870cabbb1b30db47de8a8bfa2b2c1c321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many hosted on compromised WordPress sites, which are likely part of a link farm designed to redirect users to download pages. The presence of 'undertale apk free download' in the document body and URLs suggests a lure for users seeking game downloads, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=undertale+apk+free+download+english+version PDF link annotation
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b56a1eeabb81fee223a3cfe9aff3f49a/28433743924.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/nosunorofodoxepanawefofoz.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd224e6ad---gixube.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/6afa46b86e318a0caf3cd7cd73e22d30/1255901821.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/12008419761.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9aec6e431---35715366805.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea9c9e0cff---gubatukomugononi.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/770a205cd9463a3d80d41737d3052d15/tegaxanogu.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/migowibapetosigifaz.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c474d704fb446493c4ad0395733f55c5/sezibebiwugum.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73c10f265d---pasumijerogisumeralumidi.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/lowupitusufalam.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/7566260750.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/iruregejoveb.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a3a04f0cf425b55e5e53d92dabb86239/luwosib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 5512 bytes
SHA-256: dfaa72f66defe879ccb149c77cbc8f3e010827ae9fc5edb3f35a4ace014292d0
font_01_sfnt_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 10204 bytes
SHA-256: 959d3bf0d29ca6d24180c7d4d6297e79c2d86ff6b40224c6d05452547062d067