Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfd00fc67cdbee0…

MALICIOUS

PDF

55.8 KB Created: 2021-05-29 12:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf6446f1470cf9fa276c7e7ee1b964a3 SHA-1: 67657d414e4635609d6c8d9cb437f8eeac2f1100 SHA-256: cdfd00fc67cdbee0dcadb6ff459a24a2020ee69cb164e01f366b5bedd8ed61e7
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 5

  • 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
  • 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://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/f6490ef30e6ae1377e3e1d3e30a03d8e/lananuxowiwotexonazarek.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6ba924418403612d09685852b4af127c/gofitejazibite.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96761eaf1---14707392491.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5361b751b---rivowigukupisat.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832d9e927d---4346908764.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c468363f0---kapelumedidenojobodifobo.pdf
    • http://pensjonatagat.pl/userfiles/file/39674453489.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a17e974f---ladarukununowo.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a452ec5abe8---1241088778.pdf
    • http://alkanboya.com/files/file/%5C/nutiwawizifukejumeg.pdf
    • https://lasanisports.com/files/pesopefanasewusemoliba.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1634c436---53021791939.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/99c5554e9b8a24b35d8d56d43e480b60/watiteti.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609687b7dff35---59256322174.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4601acaa---bujoniputimewefupulopuru.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a278994f466---93317277036.pdf
    • https://sambelteri.com/contents//files/31636743712.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6c7e8afd97780e245a4e8b3980a7b2f/53440530877.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/r04599eveurrnvhodq3upp3g9b/kibazevenepag.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16081c68f396be---24758180115.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=blank+coordinate+grid+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda3.bin
db5a2d49b10cd536275a6742c745284791591206ef357fa0ed8ec8bcc3c507fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 5256 bytes

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