Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdac949f7adb3fa…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 08:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f77378e7b5ba924463fd3839eb99087d SHA-1: b847fb21e6952a85fa2f4fc6ae61e56dd4a3ad67 SHA-256: 4cdac949f7adb3fa5f275662a509011f1929b094969f1c668b4bb8a9922f82c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, often used to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://octvads.site/js/ckfinder/userfiles/files/7021168695.pdf In PDF document text
    • https://altstudio.be/app/webroot/uploads/file/4394921936.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/suzezedide.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/kozivadosubedilubav.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/geletarobanazojelasok.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lugewifizep.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/93198077432.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ndojncem9pp5couoinhejic3ma/61324045837.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/jobonopi.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/28797977695.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/40904214112.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/2486819274.pdfIn PDF document text
    • http://deauville.ru/files/file/vojegaguvusaru.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614097dbbc191---40759024348.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/83431274747.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/99127861275.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/42101780881.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/ludalogutemaves.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd290e687---65805656403.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/48750628384.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/wirenumelituri.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/dowigimerazo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349d2b43fa---renukasejowogorarekiwezir.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/basuvubezosobet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=read+nfc+card+with+androidPDF 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_off0000b26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26A 10488 bytes
SHA-256: 9c5f7486f058e7995db9de0405397527d78f49e700fe2162372b36e093e40794
font_01_sfnt_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 15344 bytes
SHA-256: 225200ac9ccd76da725dee4fb980438c32db8c492027025c740c7ccf479c5dba
font_02_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1