Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe140afbee8d064…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 06:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 302943f339cc5e76182dd647e7c489cd SHA-1: 11973eccc75dcf55661e7e6f634c235bf3015326 SHA-256: efe140afbee8d0647ed0a644a995f411adb576aa05db8b2cae385cc451a4f395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to external websites. Some of these URLs lead to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=bruce+lee+dragon+warrior+android PDF link annotation
    • https://dailyiat.com/html_upload/file/39033675359.pdfIn PDF document text
    • https://thepainter.asia/upload/files/11041008450.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135655461a3f---36860881706.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130212b6588e---bigaworenofetetepep.pdfIn PDF document text
    • https://domilot.com/uploader/files/46667565210.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4b45f107ea1af55750787f351bbd12ab/matigakusekamiwuj.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/12338862693.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/925cdcbd71b67e09b4c2b95593c07753/82961399070.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/38552016621.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/revolaxolobuzopowodu.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/gewuvezufifevebugodulef.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/kemawozod.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/dozufoxejemalet.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130088adf720---29790040737.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/97458064328.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/kurilabivesorufe.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/95673185142.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/25326389357.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/75835101625.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/dobupakugosiwimepezejaweb.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/66992659190.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p7d8vka95qf8h7piahpurf77s7/86541576747.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/86010822742.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/jibutotuzavux.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ce0808e5---88262356320.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///lofenako.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_off0000cbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF2 10516 bytes
SHA-256: 2894cc04d862d02c480aba336e92ba138e87546592f19e403e17795a6f2b2eee
font_01_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 18224 bytes
SHA-256: 1076cec4f85443e323b7009651c485887b532bb205861f02650900441e6f906e
font_02_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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