Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d83fb78f2418c3c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 03:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8a2aa6669a03ccbb2a9dbd7cf5d98a4 SHA-1: c6b44a6be690e901ba61878526603302d9dd5eb4 SHA-256: 0d83fb78f2418c3cca600815cd415bc43b4518a6d07152ec7b02d15f2cf078ac
164 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links to external websites, many of which are hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=30+day+notice+to+landlord+pdf+texas PDF link annotation
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096541bece4f---67902257169.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/48996993257.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/64277538137.pdfIn PDF document text
    • http://juha.be/_files/file/poruganemafikofipa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nenadasemozetakoged.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/75475724482.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/sijemepu.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/17671608379.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fd9ba99e8---70758959490.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/nuwevorimigemijebozaf.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jlurj52ef13rob1so1g739lt7m/88605493794.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb0bbe9cd---nusuretoselijogaf.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160add1fc909b9---9876811206.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/83340494359.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/podefazorogupoli.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a641b08798---vodolilejavaxege.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/5925227629.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/25784043903.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/3025940468.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/segofumevamamijoziz.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/86851798112.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/sugutel.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/jovakeboxiparil.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/fofuvanuvevenufiwolemiwo.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_off0000d222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD222 17132 bytes
SHA-256: b4bdd2df624e1a7263ae18ff72768c606e366a408abf46081e667de331b3dff3
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 11024 bytes
SHA-256: 78872949c26680f349e80d0cc5a10fdd4a2eab514c3d9220ffafbc1c7516c095

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