Malicious PDF — malware analysis report

Static analysis result for SHA-256 829c18aa9939c884…

MALICIOUS

PDF

84.7 KB Created: 2021-09-22 19:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52ac450de4340b94d83a0c5ef057fcdc SHA-1: 8fe734ae12d5b28ef82b3386b97e53670d80c07d SHA-256: 829c18aa9939c88454c08635825bb3acf39af738ed36ba7aacfa2f64f37a9fe4
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, some hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The 'Browser extension / update installation lure' heuristic strongly suggests the document's purpose is to trick the user into downloading and executing malicious code, likely a second-stage payload. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://allytemp.ru/uplcv?utm_term=how+do+you+screenshot+a+video+on+android PDF link annotation
    • http://hzkontejnery.cz/ckfinder/userfiles/files/kutuvimirobiramiz.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/sapepirese.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqv82s7i9sj4rtspicv49mhll5/rezulivomamomeri.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/koguvabusizirijoteziz.pdfIn PDF document text
    • http://rurisnet.org/images/file/1930124016.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/kimewetapafu.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/fasopogozeliwudawa.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/migevititinozonid.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/mukatako.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/57103213511.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/63053125763.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/8157956383.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/82929569924.pdfIn PDF document text
    • http://rsentco.com/upload/file/40123535474.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/87727613083.pdfIn PDF document text
    • http://all-premium.com/user_file/files/78988312879.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/pinifivavudelepubava.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/60053183759.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142d097d465c---2674409793.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/sipad.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/sadexaketow.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/87040283214.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///foxuduxul.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490e63f1e40---nukuxumudago.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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 10780 bytes
SHA-256: f40b796059543e77fa4fd6a1c77d46845502cbdbc022ab6a2c98e657cb50ae61
font_02_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 19136 bytes
SHA-256: e30c23da5620ebcf62018dba382e9a079b0abf8e8fb87da9c5a53f1baeb074a0

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