Malicious PDF — malware analysis report

Static analysis result for SHA-256 7114be5196b19416…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 13:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ec5742a4c93f514868fd8fef78288a9 SHA-1: 6202cd211b277512c7fbe998c8580430b8b071d3 SHA-256: 7114be5196b194160d76099a94880286216f0ead35785a7cce12b11091b65218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://archism.ru/uplcv?utm_term=watch+iron+man+2+123movies
    • http://sieuthivatlieuhoanthien.com/upload/files/buxelodidiselufivofop.pdf
    • https://weekendtripskolkata.com/userfiles/file/83930028359.pdf
    • http://debsecond.net/UserFiles/File/63964542627.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/98927254438.pdf
    • http://lapenya.cat/imgjovesnaves/file/teniliziduvufolekumuwuve.pdf
    • http://sangtaoad.com/uploads/userfiles/file/xigegogo.pdf
    • https://shidoremicrosys.com/media/86379658085.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614451dc83e88---71079378790.pdf
    • http://rulife.ru/ckfinder/userfiles/files/nodubi.pdf
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/digevaseperubuvi.pdf
    • http://mega.kz/media/upload/files/lesofe.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/539cbea4c263ace7a2d5dfa2746b48a0/jopowabafosumopoxamu.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210910_C5F47C7A4E9D84E6.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210929_6A87D3510B0CC7C2.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/94079194834.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/5510472764.pdf
    • http://hanleyresources.com/images/kajonodusi.pdf
    • http://nessie-vinylcare.com/file/lowiros.pdf
    • http://abwingscolley.com/uploads/files/munidex.pdf
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/65212806313.pdf
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/titujazudosivori.pdf
    • http://artemon.nl/userfiles/file/kofigo.pdf
    • http://congluc.com/upload/files/fudotizisumuleraz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130755816c69---zapofugoridebififado.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161300dc3d3c22---19165613338.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b13b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB13B 16792 bytes
font_01_sfnt_off0000c94d.bin
995846a43208231da390710a8422e87f3cd2095ab75f518a51deee76688fc8d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC94D 16192 bytes
font_02_sfnt_off0000f2d3.bin
709cbfdd066090184fc9fc944b28b77cfd2740312f604230bc1985db1e2b4bbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 10852 bytes