Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a165e007ea4093…

MALICIOUS

PDF

273.2 KB Created: 2021-07-07 07:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 551d0ff537d780ed1bd6277b2736fdc6 SHA-1: 2c9b95443d89d3d8c4ab90e6c5168367c7d1dd20 SHA-256: 15a165e007ea4093d765dee1683ddebbfa1aaeccde4320be883688083460956c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

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.
  • 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://oresteruggiero.com/userfiles/files/kupuladobufowituwibowew.pdf In PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c5155f7298e4add8ee8d50060a46d5f2/faforuzofawebew.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a44403581---15884719010.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/v6m6vv3q5oa9db22881s88picn/reromewenilokuxipapubazoz.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2fbf9c51226fe6d26687d037cb68e2ff/xenute.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1dc68d0e---98076939522.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/dijav.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210511103113026002pltfkx.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/vowamewoxemedejago.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adaac07007f---86641669534.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/evs0l1fstvc5pg9qn2p8h39u9o/25294851945.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/tozasug.pdfIn PDF document text
    • http://vodnik48.ru/content/file/22398906383.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/11106871522.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb30916fb09---83987963397.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/13401a28b0b81ac893025d9f80e72a57/34776079827.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/98460819140.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/87996543149.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/bamorolikul.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/88442290309.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/37329993716.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dc79f856---gofewewe.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/bojigokutujigeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=2000+rands+in+usdPDF 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_off0003d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D9F9 10088 bytes
SHA-256: 3602bd058e8fa52c8c10cd8b3dd651296fccbb6502a70a1f6916efeb38cbaec7
font_01_sfnt_off0003f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F08C 17868 bytes
SHA-256: ed3c7069adf0eb7c4123630334397b3280d517af7a365bb63a2c081f629ab9c3
font_02_sfnt_off00041eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1