Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ddec26ab5075cf…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 05:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef71449d21cd6d80d4cf1ec4f4535562 SHA-1: d43965a493f6b4527f6efe67f4815634df0624a6 SHA-256: 09ddec26ab5075cf817790078d47bb2c77c0f5a90b1aacb44dbfc194f4d1d853
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=casting+phone+to+firestick PDF link annotation
    • http://mnarch.it/userfiles/files/zinevaf.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/80771032692.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead83ba9c5---votofoze.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/56096127868.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/zajoxebarolobunamefetu.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/lanamedusutejijodi.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/79255514224.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea4219ff3b---sexuvibomuf.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/20203024277.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/90637118825.pdfIn PDF document text
    • http://leruichem.com/upload/files/zebezizezasivikamolawaxol.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c48140db8a---81044254178.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cac0a472---zudulejakuzemikijaw.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/22ff143d4bddf7e6dda91dbb8cfb626a/bimolujaravoka.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/dapiguvizesikovatipalemi.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15264645012.pdfIn PDF document text
    • https://fond.ru/userfiles/file/69615866273.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/tokixesanazonojej.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/4823723403.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/xibokewe.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/85549859463.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/738598582.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/kupakogejur.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/xoxerulosirukepigenego.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374677612b2---6651579915.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_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 10836 bytes
SHA-256: 07de7dd9dc83d0ba4a4c32b727e0a177c848bd4a0a4710db68cc46af85eee253
font_01_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 18172 bytes
SHA-256: 655ca20fcd63b74da994c24e7a2fb104f87adaf7f12586a63675d18a572ec983
font_02_sfnt_off00012def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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