Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea544cf8670879d1…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 14:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ea8652bf51825669dac64244660747d SHA-1: 7dff9ad5cb3f0fbe1ff2a7aa1800ed579992de71 SHA-256: ea544cf8670879d15d6d75ba5df74ffbafd99b95a781d57c97da557ae3f8a122
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains a link farm pointing to various domains, some of which are identified as compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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 http://teen.plovdivweek.com/js/ckfinder/userfiles/files/37690825432.pdf In PDF document text
    • http://ginzaoakland.com/uploads/files/jawise.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df26ed4922---dubazisititeji.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/sozakibinivubosul.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/21998061945.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161391d64c8d34---61793213583.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/wawaw.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/14235912989.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/36407208613.pdfIn PDF document text
    • https://khanikango.in/file/17710570872.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/49863358438.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/97660309482.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/zadafegokuvap.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/da229f09639195296c57f9237021cd66/66012163528.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/48204557493.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/zunusewakimafovebiwenupo.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/fipiduxug.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631011614918072390.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/wotoxipexerutipor.pdfIn PDF document text
    • http://pinxedien.net/upload/files/konesorikolakole.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/6492131067.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/segoninuvesusozefuselot.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132620de6b8d---sajon.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/lepejumuligo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=if+clauses+pdf+exercisesPDF link annotation
    • 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_off0000bd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD26 10444 bytes
SHA-256: 6a5f75ad3c379a7df7cf4c022e460a2c659e955cdd0c14b32bbf566d7585e57d
font_01_sfnt_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 16440 bytes
SHA-256: 2982a24c2c54d45ea6954f1d64a8e1b9015558fd0f61881c54470c26ee978579
font_02_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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