Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e17c9ce5c4fb388…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 07:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e303d5dc660b96caddb942d4e194b6ac SHA-1: 2824c500b80d9eea88b20622ecc1b1c6fb291fbc SHA-256: 4e17c9ce5c4fb388834a4811bdd142f427dced746af5c25f0d652ad6223a7071
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites and other disposable hosting. The presence of 'cmdpkalu25/mujuwive.pdf' within the document text suggests an attempt to disguise or obfuscate malicious commands or file paths, potentially related to the execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://pixomot.ru/uplcv?utm_term=gcse+maths+revision+worksheets+with+answers PDF link annotation
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43585240c7---3243411135.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/23241282138.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/62762321899.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e4a03581---44896498252.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/51575738318.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210706_01302B93B56A9805.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/siwejejidagemomemagikife.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd295e41f21---gamexaj.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b97efd048c4---29498591355.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/luvedukulumatajara.pdfIn PDF document text
    • http://industrialdevices.in/uploads/lugemenuposufebulil.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/32343401268.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/46080625186.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/bad778efd38dd57b1644a2a25d7e6bc1/43429131163.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928638482be---tizopenubepapijemowunon.pdfIn PDF document text
    • https://faceless.me/userfiles/files/16288492926.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c32712311---libubeworaxixabal.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7983b1bc2a2cb63775c83b58652f6c4c/xefinipi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6417bbd68---56117983564.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/40962540968.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/kl5cvltp7j2qjgvtcmdpkalu25/mujuwive.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1610292ed1eec9---paruvepikug.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/84099665435.pdfIn macro / runtime command snippet
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093095fe9384---raduvomo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fe36a3082---tumovirojitenunemosopin.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/In macro / runtime command snippet
    • 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_off0000b7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 10732 bytes
SHA-256: ebb2b293bc79ca8c22ee1589edad5637cba43e4cf0d659224f18ba4e7c366e68
font_02_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 15184 bytes
SHA-256: e7349d66be7330b17c9435c23bfcddf8a7e9e23c2c4c327b396372abab56e425

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