Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebb4128c81fa2a8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 16:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d0b6d81eba6bb3e11d39589607ec482 SHA-1: 0866cb56fd48aed5b073310dba4778fb744cc43c SHA-256: 2ebb4128c81fa2a8d0e4bc21b34227627d4e827c9f6aa3d29de0ae8e4680ce2e
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a high ML score indicate a strong likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://thietbiytedaibao.com/media/files/nazadaniguregudo.pdf In PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb17d68ca---15203547275.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/92372392060.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/luduto.pdfIn PDF document text
    • http://heureka-cz.eu/files/tugamitemixamij.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/wumibazufibenused.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4baaeddc658ebdb54ed6370c2c0e5a06/36218469763.pdfIn PDF document text
    • http://camonetinternational.com/files/file/13701761606.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/epm1vmmcl988b9e7ok589hut05/rugubuwexudol.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b884310b897---fetajisuzolugadexazilaxu.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/72042123370.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/cfb88c0a9be087b09764d5adc9248b11/sawodovo.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/kanidevujomim.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612369df1e4f7---71458783599.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3d8cad44dbec33431a663429c0c45148/69540188523.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0255143d6---fupudusefitadur.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/puvarovuvutunufal.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/66458575302.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/wisijitugabuvuvaz.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/sufuwulavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=reproducible+econometrics+using+r+pdfPDF 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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 17660 bytes
SHA-256: 710df40eced0adaeb660f099f9124169a0e224b2a7db34ecbe0a4ecfe2faa617
font_01_sfnt_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 11084 bytes
SHA-256: 510949b6ff5ae4a8fd1362833e468413e6ceca2bda116ed2f98d626468356cfa

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