Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f1808d63d98df9…

MALICIOUS

PDF

85.6 KB Created: 2021-10-05 01:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9dcde6244ebbdef4b1e85b63b4cc0d68 SHA-1: de6d52671d1d492b08477b35fe943af407192607 SHA-256: a0f1808d63d98df964d4779ab9dba7cef566d46fb74accdfd081fc5ada55b517
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. The embedded JavaScript may be used to further obfuscate the redirection or initiate a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=super+red+peacock+cichlid PDF link annotation
    • http://stoka-saarlouis.de/userfiles/file/zurafilubanotexurigupuw.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e6ebdb9afb94a73473574b8a062f6426/zizolete.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/8986811951.pdfIn PDF document text
    • http://kgmda.com/upload/files/50985143964.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/82953134469.pdfIn PDF document text
    • https://adikmanis.com/contents/files/bejumamabitumiluges.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c8fd5772e383adacb0be248067d05ea2/87620596138.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/49795397687.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f160ae0a42bf54c446337e68c062fb9a/zisugox.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e915a649c1---36666593752.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/38782476503.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/volebexev.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/16879644207.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/17794447789.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/52915160213.pdfIn PDF document text
    • https://renetravel.ro/images/files/6915896945.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///zemuzajafo.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/sisutisom.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/disijivomowexo.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/18800659716.pdfIn PDF document text
    • http://vo23.ru/upload/file/30514407412.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/nobonimapuboziwutera.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_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 19584 bytes
SHA-256: 045fc06f103ceaa57bc8990634477a8a95e8853b8fea9182882828c34016e3cc
font_01_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AC 10508 bytes
SHA-256: e412d5ca7565de8906dd5660b6e8a705ca9ba27b0fb2b6b4d9c613b96e7adfbc

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