Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fc65d807649f57…

MALICIOUS

PDF

89.9 KB Created: 2021-09-07 02:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78fb2195b0da598568500b7a3d025d59 SHA-1: f0eb6d59b1efe6a5ef73bdf6407100ecf6cfacd2 SHA-256: b9fc65d807649f57cbe3cc8a48931745a94370b51f52407150b9eefbd7434e42
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to phishing or malicious sites. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=ssc+chsl+answer+key+2019+pdf+download PDF link annotation
    • http://www.cavice.fi/tiedostot/files/58999906127.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5ebd96685bd6e22e382f553c43d2e0c8/90028062270.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609260dc3d7ab---83176775064.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160996d6221e7a---74052019040.pdfIn PDF document text
    • http://grupophi.es/uploads/files/12543613290.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/83158740967.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/94592364612.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/45130645424.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/14901005529.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/96617810683.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/55044116032.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/lodejata.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/lotejobipulajupudikixam.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/ravebinakifokema.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22054012655.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/66448198411.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e56d788ea2e1a6127b5f8930b07424a3/nasoximilebidafa.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b298daa42089bfb728aa141db6d85457/59635094797.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/26576840304.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/11071552174.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210509055909.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/sefadobumiriwarado.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///variz.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_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 11356 bytes
SHA-256: 71c34f8b327d42c5fb2f76a4c68bc01d7d31e1a4e5ba667ab0000f77de669a49
font_01_sfnt_off000113c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 17904 bytes
SHA-256: bf345fa4e033a29eb37b7572d8c472c88b32eb3a5e69dff5233135cf1658809b
font_02_sfnt_off0001424d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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