Malicious PDF — malware analysis report

Static analysis result for SHA-256 5875be4e1a1fb93e…

MALICIOUS

PDF

94.3 KB Created: 2021-08-11 23:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bdd84e913b0c51b0fb37931d4493068 SHA-1: 9e32824fdc028484b238a9f24ac50e2e6a9d9ad7 SHA-256: 5875be4e1a1fb93edb8cda5b918b4f09c585b1b8e8b78646d560b30fdc95d830
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://isystemlab.com/admin/ckfinder/userfiles/files/41582671314.pdf In PDF document text
    • https://deltarealestate-eg.com/userfiles/file/torug.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d31c88996---tepib.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/36884305873.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/752dc7eb5a812e50a5e76d5c7182de8f/monadadowapinumufulerid.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0526249f5d2649d89abf5090de8e70cc/pagetonavamofumed.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/408504de51c80e0558bf292e260c4a3b/20113541937.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a868254e4d0---medomodofowono.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/61665513188.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/98405671024.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/49263506490.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/sedizumugo.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/savaza.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/65508868525.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a3ad3c8e8b---85929151365.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/xoxelikizeresupi.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/ruzepegufido.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a9dd87adbc3ea57eeb71b3e64c94e33c/widuturikobawoxu.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/binoza.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07059a88b2---befezikovop.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a254d52777f---77209314796.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/jozop.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tt43uv0ft5goqa6dil7l2e6t1v/86122610072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+do+f2l+j+permPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 10460 bytes
SHA-256: 1dcaf7d49c9c8ad32c289d90770248b663eec0c16435349612ee8d81d771f807
font_02_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 1992 bytes
SHA-256: cd0cfac502e4ca6f2226d85c9141bcbc53c055c73572a03ac62bb6d1f6440fd5
font_03_sfnt_off00013ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA2 17420 bytes
SHA-256: e3acd972f5c6cdfd3de4aaf7ec5e9748e749f37cd884171abf7e7434ce99c55e

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