Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdfa9e78bed0eaf…

MALICIOUS

PDF

98.6 KB Created: 2021-07-17 16:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77ae58e3569b8794daa8d7c60a663533 SHA-1: 3ccaf1739076ff9d4c9218ed6f353a82c6025dc2 SHA-256: 0fdfa9e78bed0eaf67fb9865d9d12fa8ded058b1d6736d61bf44a30587485c96
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The document body is unreadable, but the heuristics and URLs strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 6

  • 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.
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bc242db4617---71189578178.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47ca069fc3---935698973.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/75622718657.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kagotujivoxu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e752bff6e---83382551743.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f64c3e22---46635605162.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/gozakojokijijebipadita.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1bdcc99fc449360dd7026d94f2cd84ff/17050078439.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928a8b1bdf4---7499354102.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff7c31e4b6---61027189151.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f655e98d4c---bumolukewipenasuvutizi.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609498dfaef77---wafobefara.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jubapek.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607196e7adfc6---35835771330.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a32bdb1dae2---pamigozapofal.pdfIn PDF document text
    • https://latework.cz/soubory/batuzotivorumowifevas.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3ccfce1669a8ff569bf57f5fed70cb56/revepukebudama.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b1425a334---lixonon.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb12cd8f0c2---suxomal.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/11584362413.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/60663377339.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/fifuxavadew.pdfIn PDF document text
    • http://nensi.si/upload/file/melam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+a+word+processorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 11560 bytes
SHA-256: 9573002f9ff9f28a713295669dbb042723467b36fe30d1bb9c762efd2999aeff
font_01_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 10540 bytes
SHA-256: 53f6e06b5f249f41cb9c4f0a3dd1b54c2a988ae063f1007be5691a55e523a926
font_02_sfnt_off00013543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D55 17920 bytes
SHA-256: 6c00e48df968c4ee81ef33496eee13fa36d22fb0ed29b1d0eaaa69fa2bed1fed

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