Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9555e4023182eea…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 09:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 011e6496ab561a782b7327cc0f8c2d5c SHA-1: 36aec954f3bf1687ae8ece12318966def965bf3e SHA-256: d9555e4023182eea0b863998e8f8fc209940696192914dca34038d3b86d9fdd0
176 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, utilizing an image-based design with embedded clickable links. The numerous external URLs point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chcial.ru/uplcv?utm_term=dragon+quest+vii+android PDF link annotation
    • http://benetalent.com/upload/files/33773302452.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1b18d1ef---14985092086.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403202e1b09---fuduxobetozepirakunurobu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8b7328134b21edd32e695369931b09fc/3461717050.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4f15b862---fizoziwuvakigukotepomutiv.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0a96c3d90---85876258165.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/tapepufujitusanupodefuni.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wojedidu.pdfIn PDF document text
    • https://fond.ru/userfiles/file/dutunanigo.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/nimot.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/17449698030.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/gazet.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/11046643997.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/72df9a7c7e8b781101f6c93bc9a7751d/jutiwin.pdfIn PDF document text
    • http://castel.lu/userfiles/files/razatiwowazanixafojaki.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/76010767955.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fpn81m9j50p7tv29mdp40qdqp5/fuledi.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/84023394000.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/1168081663.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/67162959717.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/gatureborabujirudaga.pdfIn PDF document text
    • https://shidoremicrosys.com/media/fokijokiwoseporatimegurix.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/40012179339.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161489fc6cd7a8---22692866194.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/sojedu.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/59148663813.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08abb6a9f---vumematamifulisarobis.pdfIn PDF document text
    • 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_off0000b41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 10692 bytes
SHA-256: 083ec881816dee71f1893e0a5af019453e85b9200d8568b2c34d1e96fb06ea37
font_02_sfnt_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 13992 bytes
SHA-256: d2ea6581de47de1fe2b17caa0a837c7c1c4e7c0c8b5db13fdf97c323b712f85d