Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3f9c76c16c4c41…

MALICIOUS

PDF

81.4 KB Created: 2021-10-08 15:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c7f048a3f16fed05f71b1b98f8d83fef SHA-1: ea0e204eeacf07e5fd7ef0ecb64977570419e8cf SHA-256: ce3f9c76c16c4c41691d264e4e6fc54e85eedc033ab74d336acbe4d959ea77db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=hyperactive+adhd+test PDF link annotation
    • http://ankaraeksioglu.com/resimler/files/nitakoson.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5097c15eac2b2d36ae349d95f815f486/loguxeviwuzefirav.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/degaxuva.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/jidopujuzurijop.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/36695580021.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/kutosupuxutekufovaravuso.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/42740924273.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/fuzeworesidipuwesot.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/vamakos.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b0suprkotqks4vo43ll2smfp74/38300517331.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/48323173883.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/87142477825.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e334f908d8---mugetonajuziponuvesog.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e498e0686---papozibeja.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/55125555696.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qoitt593gj1ghskpdmlc4j88k5/xupejatosa.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/7746476585.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/ketipixusebanorevozet.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/2806284052.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/59451426540.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/rimaxozop.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210925222305.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/90308857705.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bef04c2af8---venujepivo.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/80075137241.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16160361a682bd---36942318112.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/ranewu.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/fesunopudunogo.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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 10512 bytes
SHA-256: ceb2b67fd6d17cac2b8d5df00af2bad7a271bad1caf4ad8beb6cfe2a33c4df24
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 17216 bytes
SHA-256: 6964bfff6925d896d111033cde0c444c6bde16cd95ea3a54d74dd4afd487d560
font_02_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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