Malicious PDF — malware analysis report

Static analysis result for SHA-256 163eceece4054a5b…

MALICIOUS

PDF

87.9 KB Created: 2021-07-08 04:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1eb19af2c8e73fa0b46756a0002f46c6 SHA-1: 5778925d311fdf6565f91ad5625088b8219e81e6 SHA-256: 163eceece4054a5b3f2d084e419f543b5bebd39b47235f3bb55f5e12af9877f3
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://autohondl.cz/userfiles/file/30776710274.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/nutejunen.pdf
    • http://washchienluoc.com/upload/file/97948391656.pdf
    • http://agro-partner.com/Image/files/32233454932.pdf
    • http://prestopc.it/upload/file/midezolakojojobuno.pdf
    • https://ready4use.ru/uploads/files/53597500507.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/64042d2a6dd37ff28bbeab2e777a24cc/xudixatakapamu.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a00344ee784---ziregasidudavake.pdf
    • http://montgomery71.com/clients/34132/File/jirepeferupumuxupulu.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861703400bc---kidesakibuk.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff756e98b4---vevot.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/156f06b09c69eef132e7aa40a08585b5/jezedoderorasew.pdf
    • http://zjhywt.com/images/upload/File/laxagosug.pdf
    • http://say-international.eu/userfiles/file/xinosixapotadiboma.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/0f9c632b34cf88db0bfe3b4d3817bf32/1876220364.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a780ed6c---67474678291.pdf
    • http://lookkorea.net/userfiles/file/4297859124.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071e435a06ba---rudarogidejoxaxoraziketo.pdf
    • http://yao-cheng.com/uploadfiles/20210703153559.pdf
    • http://wwstationery.com/files/file/16489903437.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1l659d1vlfg64mnjupcu86bb8h/1913176726.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b172e110ebd9012e8797e466205f302d/voxonovemakoku.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/67159996332.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084589d62763---kipitiwojamuduro.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb196f7755f---vivisaw.pdf
    • http://esoftland.com/userfiles/file/40340504420.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=movies+counter+hd+free+movies+download+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a4.bin
2482ac09a6d7b243c229c74f8edd754f2d3feb1b392cc1d94d3d8ffb3a18f68f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 17104 bytes
font_01_sfnt_off0001203d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 16792 bytes
font_02_sfnt_off00013854.bin
9b52b60f659b38751dcd6372fff17caceb37d7bdb71c740ad7e5a658813abc6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13854 10988 bytes