Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a59be867f40e3d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 03:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29c76148e1b9abc87f4665f9b07808bc SHA-1: ebef3939e3dcc7e4a5a0dd5ad3d5113881f23b9c SHA-256: 79a59be867f40e3d2e23104f5f9ddd0c3bbd0953b731adc14be089bdf09ec915
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

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 http://omegapizza.net/uploads/files/mebal.pdf In PDF document text
    • https://ecoverservice.be/gallery/file/54692310414.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/julani.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/53727065367.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/93c94dbd02fb71bae639922def57c3eb/fumakegezajiwovaxewa.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf914b7bdf---fafusodutarok.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/39340889865.pdfIn PDF document text
    • https://loctra.net/userfiles/file/murutobana.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d813d1b8---jofepatek.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/nobegudatixuvaxofuf.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/kizinomepabivaxorefo.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/dabegaxinifaxutavugax.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/17813576998.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/64876550849.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080220255063927.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/rozanixebosovi.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/begavibatizaraxebivek.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0e32ec39c496e2fe20186569bc49b656/ramifokigelapima.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/lotikurizisawemuzugabox.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756b4ea98ff---molanufa.pdfIn PDF document text
    • https://isleo.com/i_photos/file/paxixufujaxewopupobasi.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/petofoxidafegofiwuwigidol.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c58bdd053c---fitarabigapofetoradev.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/mokadudexugapagaf.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2d533d46---jutofedopimiwaxax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kiss+the+rain+ukulele+tabs+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_off0000c2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E5 17732 bytes
SHA-256: 3aeee518fd5be686c5130097975e6508927413d3a86a1eff4e814c1bddc8629c
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 10800 bytes
SHA-256: ceffdec28ed6dd449bed3feb0525454d019479b8163d248ef28708b8d0e6442d
font_02_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1