Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f0d8a7fadbd993…

MALICIOUS

PDF

118.3 KB Created: 2021-07-30 22:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: e13688f5d79c2df5261b206ad9ffd8bf SHA-1: b485d3108e3f31f23e7ab81ec7f02922d90b9a1d SHA-256: 35f0d8a7fadbd993299d7806193c179abb36595cda22758fab380ceff05b7976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://autoprofi.ua/userfiles/file/tonesuge.pdf In PDF document text
    • http://mintaialuminum.com/d/files/94342875927.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/zunomuj.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/14409971308.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/98767569353.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085d54585d72---feleguxufutiriwiroze.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cddf508c6c---gemizeriporodujaso.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/84622656546.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/14226179605.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/61074771796.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/zebolosalaso.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/fagigakogezid.pdfIn PDF document text
    • http://hibertek.com/image/files/20210617_095800.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219932e2fc---88699870212.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/tikuxebu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/703eccf28567bbf0f91ca341c6aa9456/82923434213.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/231j3e7vm87nr31479u7ca9q61/sajev.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a16156b8370---feloziwadojuxejurefi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4a527520f---xowizodekejulekosug.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/rezakapitogubekofopukex.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/eaed28cfc336b7d023304a0a7ccaa7fa/xumasopokibevulokoje.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e51aadf3b9---57292380048.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0e9454abc4442de08080168bf66d0c34/tulometiraxe.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb774120d5---xipidamomel.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b542f86b46d---12174796931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+determine+distillation+column+diameterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF5 20584 bytes
SHA-256: 1c6ab6fa212871496d67aabc3e589aae4ca709e1359cc2dd5b47707634652fdf
font_01_sfnt_off00018365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18365 10708 bytes
SHA-256: 3d61fb72a72faef7c68a4ead09ccdc275f534108d4732979a559b587263c83f2
font_02_sfnt_off00019bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BF8 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off0001b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1