Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd09ee9d2db374eb…

MALICIOUS

PDF

176.3 KB Created: 2021-06-10 09:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d8ddbf014f54e8bafcc13b2e9a46134d SHA-1: c50604437bcdb74ef35285a34dd9bc6c011ad4ac SHA-256: dd09ee9d2db374eb87a555ac841eec6353debd8a66f7d5ad99be823b718e10eb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/uplcv?utm_term=end+of+chapter+questions+chemistry+answers+igcse PDF link annotation
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/301b9db4f3d5a26de36293b63d7f0b1b/sobepil.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ca583fff2e4e024c5e2296121ff41d0a/kevogifogifene.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/semijafivutenubupegot.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/b089vvjlhcpu4cf3v2lm8asft5/82858094642.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c02682bdce9---44021016729.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0otu3r339ikgnad5s28dhgv7p5/dokowalo.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/zexovokefolebugu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18e5ef243e---23567944076.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/164bba28de8b7f79a9b7f6cdb823011c/bogujibovotemurari.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085da4b93fa4---2600087256.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3504bbd925675826667f5ad74f5ddf93/sikugalemosudukikiwawumi.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/55713606942.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ed75db83---jubodigosixitojesozu.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
    • 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_off00025bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BF6 5812 bytes
SHA-256: b43e813a2be0e6209310f115dae4f71724bdee9dd3c7f0ea0fd0a1a872d2e7cd
font_01_sfnt_off00026fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26FB2 13860 bytes
SHA-256: 82f649912629bb40d47cba59a5d036fb8d5ccad27838ccf7983cbc8c60d0c75f
font_02_sfnt_off00029e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E93 16100 bytes
SHA-256: 738170ca93733cf3fe8d5d9af6e19279992d3ac9841a882bf61cbfa5b9da7e48