Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03b156435bb1862…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 05:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f5c637fced4ed4cdc2c1d918a7c9b76 SHA-1: 6349b8a2b4b70c73fa53e444e8c816a08cafbfc9 SHA-256: d03b156435bb186252f20ebd876c49ddf0e6e078103e10b52fe36bc349712581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on compromised websites and disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/730a57a8d0c88831c794d5257bee8e73/86399430576.pdf In PDF document text
    • http://axwelindia.com/uploads/xedusev.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/mavikop.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/rawojikukaduvoduletuz.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/pejofixekexudupijapu.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/laxidugiluzol.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a519522ba4a---duxobizizipejakerugiru.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/zotebirarorivuvuwotun.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509213840816.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/4262012503.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/7973880954.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210706214216.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/lusagogawemipasewub.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202108301300379744.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2baa6b77c80dd672debe08e5000d2748/46868619996.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3756447a86---befuw.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2eac57f6---bexatutotexukekenagakagij.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/dc6b046967028d2df2d7e18160f1c70a/1595718887.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a9e320eb---dinopuwazopuzupupisoguk.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160717ab2e02cb---mabanajubujizosodewonu.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/peraxabejogonesazivixiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pre+reading+skills+for+preschoolers+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://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_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 17708 bytes
SHA-256: 5ff78fe96d4950c7fe08a386e87f71a187e730ee584d7482018b3518614ed6f1
font_01_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 10896 bytes
SHA-256: e4093fbf629de094a84d5619005c795e2b3cc5658afe7118dc5e2f966af9814c
font_02_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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