Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c4118c167db946…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 05:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 893d852f8dfb60675eae0beeddf1a485 SHA-1: 8e30a175d518499a7d0a067a751dbd66dff1afdf SHA-256: c1c4118c167db94667658ce6568a2dc117cb2f0462571e91a1cd3f6bc799df20
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the PDF's primary purpose is to host these links for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/57ea6e56a33910afdff5d89947ae4deb/noketamodebaf.pdf In PDF document text
    • http://churchtextile.com/userfiles/file/28389791212.pdfIn PDF document text
    • http://farmina.ru/uploads/files/fedevudadogoxiwufuxabuli.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/67829489069.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xekatina.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/17591541022.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/nitede.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/varodasidirojijaku.pdfIn PDF document text
    • https://shunnasato.com/zojazabepidemijak.pdfIn PDF document text
    • http://ladna.pl/user_images/file/2660221543.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613343e933d44---mozusimegezukulazugovuji.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/lotasomobapan.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/40727775274.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614081fd85036.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/wefawinazuxedunudumotapip.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/tebajena.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/manureboza.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/80323581356.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/temodijifanegexig.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7b596bb8591fb4a7c5e723157c9dbf6d/67774835350.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-3/20210903142606386920.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210918191145.pdfIn PDF document text
    • http://cartopack.com/Images/file/40238953005.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/nuvigaxijuzij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=transfer+itunes+songs+to+androidPDF 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_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 16932 bytes
SHA-256: 899d9969f134a54648b8e79edf19e3800319fef52942086e32ae1773e4a5dce7
font_02_sfnt_off00011e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E07 10544 bytes
SHA-256: 89060c9744af4578d91e61a77189010b5bef3eede714ae28ce291f829ed3acad

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