Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb062b03c5c4477f…

MALICIOUS

PDF

72.3 KB Created: 2021-09-29 08:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6bd532a063cfd06560308db441fc9659 SHA-1: 7b01bdfe74ddb34352c9831e4b4eefb6cdebea44 SHA-256: cb062b03c5c4477f2eecc86734c344913d9e9527a2a3795a936c17ea418ba2b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, including links to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the URLs serve as lures or distribution points.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=caller+theme+pro+apk PDF link annotation
    • https://planningpvedh.nl/ckfinder/userfiles/files/98961336037.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/4305339858.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/6790235989.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/19023714716.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/toximeporuzodi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6a55fcadfa335b177a18241b368bcb83/69940120558.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/vozararokufi.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/42341028806.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/75931315896.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/jagevupisugafemexixibawo.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/tepemobutegurijofa.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/2cdc2bfa12fe1ee42da935b26edb74be/wadalatowoja.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/26292035088.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca1629909---ruvejeromaninegozubu.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/3928262736.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/teretimiriwudixetedi.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/rorogarabuvuni.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219111650492398.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/vedufolofogagewi.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/88009205532.pdfIn PDF document text
    • http://carbonelite.ru/file/marupukemosivujonek.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/82855582236.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/24117130997.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/najamoludopimero.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_off0000b5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CF 10276 bytes
SHA-256: 5e16228fb16ac35ff79e4c8818662a3e950de1732cf9812e514525c95fccf318
font_01_sfnt_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 17924 bytes
SHA-256: ba1d47452695fde9c625fb6213b8982f7d26fc68ad04cf393a98e61b78811c5f
font_02_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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