Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f88a7f10aa32c6…

MALICIOUS

PDF

95.0 KB Created: 2021-09-05 14:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb7dde242981b09ad480e188507149cd SHA-1: 46450fc803b5fce50697d09ea89c83bef4edc6b7 SHA-256: e8f88a7f10aa32c6960d50cddf903cef35d3c86aedeb8a6f1a3d148fd50682c3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19fe49e2cb---xizeposogazokujidex.pdf In PDF document text
    • http://kapelski.pl/userfiles/file/pekelifazagu.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/58858318119.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c92f09b7e---49277638156.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2slu1nj9c020f3sg13pv5svub4/91554096018.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/paget.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bipob.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/16459473923.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f1bf4946b2a488fcf451e8d7e639e120/kudakovodedodukamapomana.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a378fecc5d5---41582707294.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/500dd0e536bcc5510af19044f49f6019/wupogefofuwebezirazorikog.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/lulik.pdfIn PDF document text
    • http://rjt1.org/upload/files/tibunemoxoxuzi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ec8f1af12807fb6a289cafb6be3d9f0c/75085454298.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd56bd7f50---vevukajibesupanaxu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/hluak5rll1j9a3cpd39520huk0/ranelidar.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/sawalijokavilodoxu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160859f8d61b3e---51843764604.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/gofubuwawidozosedefunow.pdfIn PDF document text
    • http://classtool.info/upload/files/nubanajewivet.pdfIn PDF document text
    • http://xn--22c6buakeib3ax0bzcc5b8tlc.com/userfiles/file/17534160853.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/xeguwim.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607600948d5ca---97516541552.pdfIn PDF document text
    • http://licausi.it/userfiles/files/jukudanaxobaborun.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/67371487601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tap+drill+chart+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_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 10156 bytes
SHA-256: baec8ae63d357fc7b375093e1f5ee556e80f75e6c5b3b197acce3e1c0f2ac17a
font_02_sfnt_off00013935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13935 20824 bytes
SHA-256: f794a1e84076bbd63d7cf734ec4f0b87e5406f8d6d8154062a9c56d95f94f30f

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