Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2eb261cbe2fa7f1…

MALICIOUS

PDF

86.9 KB Created: 2021-08-12 20:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7ea1fd116a1cde599136276b5903a9e SHA-1: cdd7f93d4ea3ce1e9355ebdda7f0a88f4483ca65 SHA-256: c2eb261cbe2fa7f12e67b3eff5e0f6c7559e06f9cc7f5253b92559956f7e511a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple links to potentially compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sunnyrosesschool.com/userfiles/file/fobuxenafisapigedupiduw.pdf In PDF document text
    • https://hanyauntuktesting.com/contents//files/jowomogenazanowuzijure.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/r4jkfcsh0t33q5qotspcbhvne0/78975777982.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac022a661ae---nebixujumonetovep.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/5942149751.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210708_047718F0A36A99CC.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/jugageta.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/xirek.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/83010255371.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/8h50fd1kta458n79ckda14206o/39242247560.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/joripopaberezamakupexejis.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qunoegqijk9h549jp38hh5ichj/jajitazujamegaparumab.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/66577037995.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/luxexunajojulid.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/refumoxi.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/kipepe.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086098f9b667---jodilusexebibarojazisuwob.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sirutomukomexibimanetixiv.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/3k4qqhdvv10j0lk451m3ba14ns/55209842681.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/h7jn4gojr5r90vu8cejvsrg5p8/foruso.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108100620594834.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/666c0f03c4d45518ecdb8a98d523f6fc/lezerifeganufeki.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/78432320089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=turnitin+plagiarism+checker+canvasPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 17176 bytes
SHA-256: 08fbc3f01c4b8eb6cef72472bfcffc62ae5cdc0e5fa1e95aae0c8ff0965c762c
font_01_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 10920 bytes
SHA-256: 17496bd10afa6dc7cd9a25cea41c58ac1b12c658513c7440731b499968ba651d

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