Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8e5ba47e33cc24…

MALICIOUS

PDF

85.9 KB Created: 2021-07-20 10:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc806e4e7b0a65d28c95e20d9d3a8ce3 SHA-1: 3e7ee904961e847a1e9e6be1ac91b30eccaf2ce2 SHA-256: 9c8e5ba47e33cc246e5aad384dc1d2c5b3602510e6fec836703ef2ec76f9ce57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f374651c226---43811514143.pdf In PDF document text
    • http://domholidays.com/userfiles/file/lidexemejexar.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/77645483971.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/10687437545.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e56c3a47a20---46186023451.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/m4kgok3sn80ms5tumfr95a56r0/nidedakevopumibaral.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/jokelaremux.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/236b14af152ebdc4a2077580ee534e03/96656594783.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/26511469829.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/mixuxulozu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/3f9lhpb35j0lr6dj4veb4pr1n3/sozetirona.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-29/images/files/65768704586.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/7177677922.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/kemuxo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2982f3acfa---89969407639.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/xabivaz.pdfIn PDF document text
    • http://vejwun.cz/images/vuvavebomerazowagawub.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/vemonejemikojowo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092c1f05d980---wowufugobojuvut.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/84fba8f30639fd44369c9b6ae3354bc3/xikurepebiti.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/tozirexupux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=steak+sous+vide+time+and+tempPDF 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_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 10740 bytes
SHA-256: 01c62b2e9f642e4051f6fdb33ebcafe9c1033b02dc59a23b62269f8d6030f976
font_02_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 17788 bytes
SHA-256: f45d492b79175c5d097dda33d3f8764e755f732f86f4f4aec7a285f185e02aeb

Open this report in the interactive analyzer, or submit your own file for analysis.