Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c33cc60ff6f0df…

MALICIOUS

PDF

90.0 KB Created: 2021-07-02 23:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b3515556a063d6a9223428395d757a29 SHA-1: 67e24917d0326b6ada78e042c47effd30e479a5b SHA-256: d9c33cc60ff6f0df7a9b3e58e246bd474c33cabaea88d56fe97edf7f018066fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads, indicating a likely phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The embedded JavaScript likely facilitates the malicious activity, such as redirecting the user to a malicious site or downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=adorned+with+gold PDF link annotation
    • http://dekoblickfang.de/userfiles/file/99103057936.pdfIn PDF document text
    • http://gasnguyenanhst.com/js/ckfinder/userfiles/files/boduvelobasaxugumati.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kudujojex.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/fuzewawesuvonoviwosomuv.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/3cea78d3abe1ff3d3a2f75f8b968b0b0/saruzajovegetozubebebev.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/f1244be9ccbf534010cb91a5ac69093d/kubawisetojarokesutebag.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd933bd156---84123200209.pdfIn PDF document text
    • http://tcihk.com/userfiles/6009862534.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/de3ec8d086be6226a84d3207b696dd0f/20329098631.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/bamunemoxurutowusani.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/pipimesukinegazodipirer.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc83841a15---xozasafediboj.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/256923013d214857af4916403efc7e9d/lisovupotenilege.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/xifutujifepepo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/96332091055.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e396daad6c72f03cacb94f1544756b15/zevegetupukiwo.pdfIn PDF document text
    • https://medius.sk/userfiles/file/piwofozof.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/75367778597.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/keniligowivikina.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8f509704---31543939513.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/40145662105.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810fe12f0f7---16274821035.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/32968797143.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_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 17876 bytes
SHA-256: 3e1633a859dcd36316cb25d0d3b04ec332db615b0cfcb38cda886cbae7134759
font_02_sfnt_off0001446b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446B 10264 bytes
SHA-256: 45c9376f4e1da6ca52115c99f5aac1da26c9b17bcee3f64cdbf2e40053d55d91

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