Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cfe2fdcda45551…

MALICIOUS

PDF

89.3 KB Created: 2021-07-13 06:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3295f34a4157799cd98160f304f6f268 SHA-1: 1bb8785d8c62419de018f21f1ce928b00524bff9 SHA-256: b9cfe2fdcda45551da7e1f5a093e7470d3dbe6870073ae0e399d8c98be477ac7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a lure, likely intended to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/01iflk7u9gattnnhsfq964f0a4/31564939859.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c411d4b444de224df570ccb8490f2ba7/vafusedutikulifebeze.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/48749914306.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/bnv9u2jtafooppb0sfluu9nn50/busebetemewigabokeg.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076299da2938---fifuwajoloxinevonuguk.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ebae5a43d---rabufuvuwokexuverodi.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073ce7eba38d---puzopofatenizira.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/5799352716.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/49307556189.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bhv65928d5flq5c7la5a99ikc7/nijazekuzu.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/95799504090.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1a936e1f---78615689441.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a20771bf6---juwurupafuzenowaxexo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a5374fd2---20834251517.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/vimareruviduwamis.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/5415812506.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/putegimapelikozapasak.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/tiso90ivp38re58soft3vgkjgm/fefisosaxibepugo.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/82881507487.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c59b4ca8---rubosuwi.pdfIn PDF document text
    • http://novichiha.ru/pic/file/juwupoxorawip.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/45984398607.pdfIn PDF document text
    • http://abnicum.com/files/file/68623475476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=essential+nutrition+actions+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_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 16900 bytes
SHA-256: 68f4cab95b823f7825232ffadd1c87c4f7208e3fd2486ac049d4e68dec7735c6
font_01_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6F 10696 bytes
SHA-256: 53d7da5b7193cbebe0a2ebbcf62131466b56b08fd7042178bdfb833fcfdb80db

Open this report in the interactive analyzer, or submit your own file for analysis.