Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11dc8b8542cd570…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 07:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2d583d83f10efebf921d93a1a26206a SHA-1: f94deb013f1d0e15720a29434a2682021a3724de SHA-256: e11dc8b8542cd57045edfb389b43f5f642d1f9b776521990171fc7a1d64362a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the link farm structure point towards an attempt to redirect users to malicious content, likely as part of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=employee+confidentiality+agreement+pdf PDF link annotation
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607196110642e---41682977447.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609982914da4f---16221448059.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/20168612616.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a31ee73174a060f26aed61d881566393/68020658495.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/47842b826b6e4bdf5152600a4392b344/vekenirobeg.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/bumevuwovoteretabu.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/gonuxelabopezuxazezijola.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/dolujovokexigagodibuj.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zasejojidumogim.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8bc2f7c65e30cc1324a1b1db9ad6220e/wegubeluweva.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b24057f6a4d4f778d5eeff34e16d2600/vowikoxozukarofuzex.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0855c5822---42979017438.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc4794aa9---57491914658.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff76c3ad9---58641018495.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/21289904999.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8e7f2604---32429454700.pdfIn PDF document text
    • https://manorhair.com/uploads//files/202108041748348648.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/16773850824.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd198f7f7---wodak.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/dd33fc87b8932b6dbed5a8260f87c692/povitogutago.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/zutosusexelawukot.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e5328fc9d---zizekijugazimefodepep.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/vibezasogukomubezi.pdfIn PDF document text
    • 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_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 15880 bytes
SHA-256: 191f9a7cf11781c4f50a6ba6cb0caac39949f17ed0d655a47ff39a8b01e46586
font_01_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 10892 bytes
SHA-256: aeddb9c42f5e411c4c510576b10acde2c2c7c0fb648ebf6af314a1bb56e79544

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