Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6eea5366dac8c14…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 01:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8d168f4cc05d4d055375bcf5080ec83 SHA-1: 20f6ab08152ccdbb6501f169671a71f624545083 SHA-256: b6eea5366dac8c14ba79cc40ca7cf02ebb389c99806c655859bc8522078b11e2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF's structure and the nature of the links indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/55616184179.pdf In PDF document text
    • http://hzxf.com/images/upload/File/19629662942.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/46258989149.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/8681568572.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zirotijukikekuj.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/nevinolax.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/28397901068.pdfIn PDF document text
    • https://mavibusiness.it/file/mojitixikoralume.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbd8284ef---82468193978.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///63390830167.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/totobilukuvemopavovax.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmqlhf7h271ppst01f435tlfsf/39108664022.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/73404197677.pdfIn PDF document text
    • https://ancoraeducacion.com/images/dazogel.pdfIn PDF document text
    • https://jck.ro/userfiles/file/18559593877.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/sagejefofafotokobe.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vnt7m6rs2d3c5k3p7o0rpa2jb4/numokawupol.pdfIn PDF document text
    • https://resicolor.com/upload/files/fezoxoj.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/13627186286.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/76596128415.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/xuwivimobakelonatijudedo.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/wegivu.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/12051056975.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613641b210aed---19264962636.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/42592348448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mini+militia+pro+apkPDF 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_off0000b49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49E 18172 bytes
SHA-256: 26b24f920d20f2c1f0f7f314de0959c7f3757dbb252fa8b756bb48c8ff253d2d
font_01_sfnt_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 10196 bytes
SHA-256: 778e1fc3a3d07599ec72173f9770ac4533bac106db4ca66b538c902b3eb9330b
font_02_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1