Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78948d0db79d157…

MALICIOUS

PDF

103.5 KB Created: 2021-07-19 14:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 46c190b30fd7795f47f71db4140d2e25 SHA-1: fabd85e684d32614864b1c715268bf3478a96af4 SHA-256: e78948d0db79d15720679acf7dfdaa1540c5fa8abd3f3c7fa208c11f357d5968
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16092779648258---fofarurunapubo.pdf In PDF document text
    • https://tennis94.fr/img/pics/files/jowarorabaxebowizexilu.pdfIn PDF document text
    • http://topstec.com/d/files/mejopabogatupoduserorari.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/63045530302.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/88178894863.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/pukelepo.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f9665e35---87382863834.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/2b439495a7aee8a299796ac8180d5210/vapibigidakomesazibudu.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/35712508385.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e587fc9284---mulisor.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/regerubokuretugawane.pdfIn PDF document text
    • http://industra.sk/userfiles/file/2850989385.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/33527896631.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/tefuref.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/89336593058.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/5f08f980001ef740cf6541454a3c57bb/6576019573.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/tazepopugalodinexe.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/49874448667.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e6a2cf9d---wituzetuveg.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/86616196033.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/47014bde6ba56f5ce051d28acd884390/supapirogerujupivigajuzed.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zubikanonojosukupe.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/33929367791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=1+page+lease+agreement+templatePDF 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_off000133b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B3 17360 bytes
SHA-256: be147eb080c84fd57288fe062d23d567b7abc403d467bf84490f1e84f43930dd
font_01_sfnt_off00016166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16166 10336 bytes
SHA-256: d9c7ee24fc5e5c72f0a0d58167a0f72ee551f54fc312d41a6c927a8634822ede
font_02_sfnt_off000178c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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