Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8bee8611b2be17…

MALICIOUS

PDF

71.9 KB Created: 2021-06-25 06:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e4bb7e296e46abf26ce31152aa54535f SHA-1: 9f08a708b6c8efcd3ec1136f13619eac9e6cdbe9 SHA-256: 0d8bee8611b2be17af934b1f0621fe8f2f0f48077510863bcd85f34c2d3533e8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to redirect users to external, malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketnoikienthuc.com/upload/files/59637160964.pdf In PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qohb40jjv7ti4gdnpob75j6jn0/lulopufokabokaxitowiwija.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/merixuj.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4bffb40d41af49fb459c04320ea033d2/49514945544.pdfIn PDF document text
    • http://fullx.net/files/bedafusanexipage.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/logogixidabetolujejit.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/96231a2de6d67fc9022c6799d04eeba9/24200718722.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/83953520746.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8e90da4d70a7a93bee7618a4600959dc/78558027316.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/79428489297.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/deb3d64fa557575470cfc980aa127a72/33333614680.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/98593249060.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094674fa81b1---39517221065.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/80048bcbff6db72d75fdfb859d1848a0/91556146975.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vomobumekuxinife.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4f5e0aab3096b7f71060dc366610df7e/zoxumurajukuzun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+nice+girl+syndrome+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 5408 bytes
SHA-256: 979037ecd555b3b727a8665d5f0378f3690450fceb3aedc8aa241d8b58be5df6
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 10420 bytes
SHA-256: 57867a640dc1c4d4c6933d107d5993eb39464f0aa163f945ee4d8485e07eb11d