Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ee89e71ef87e1c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 23:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 145f4fd534a1640ea124047f935c60c7 SHA-1: 3ad40d216ab687ae76d80fe7e85e07b99a99018f SHA-256: 51ee89e71ef87e1cdd9517f448282133012a5643fd6d252a6bc78f6fc32d2fe7
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=fanatical+football+mod+apk PDF link annotation
    • http://angelofthewinds.net/ckfinder/userfiles/files/2559159343.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/donebimojelubil.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/30068521459.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/18006623159.pdfIn PDF document text
    • https://dintek.eu/uploads/file/zegeroniwedes.pdfIn PDF document text
    • https://laps.pl/userfiles/file/jomovup.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/kidole.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/96043206646.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/sogatelumowexalomujubi.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/41646872332.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/zarudatojoza.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e663c276e8dafbf68c54811f0bc3aeb2/61868989313.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/nowuxiz.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/146ba98d7b3a28ca079b7ea33aa6a484/61675965317.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/14625852435.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/16178362558.pdfIn PDF document text
    • https://alariel.be/userfiles/file/sojeduruzuk.pdfIn PDF document text
    • http://yuha.be/_files/file/kapelosurewunizasuzexamek.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/terijepakofajib.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613635c5a30b1---fumigememi.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/romuwi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0561a31b4045409ae910097ea6018eb0/liron.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/penawu.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_off0000baa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BA 19600 bytes
SHA-256: 704c853139b6a400c0790478683614c6a5597a3ae8b834f6cdbef1e6a8063cce
font_02_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10592 bytes
SHA-256: 4f5e8eebaca7856bff01bf39f2cae3b970d268b9b3884ccbec088b8fd4375ee7