Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c5b174c48dba4d…

MALICIOUS

PDF

75.2 KB Created: 2021-06-17 15:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3b7d38b0c21e3988095623677ec925f6 SHA-1: 778bc242798d4feed0550eec1331311f462cd7b5 SHA-256: c4c5b174c48dba4d9e17ce2740dd26726ca278bc44895d0fcdc61dad2c5ae520
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7791

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://catamma.ru/uplcv?utm_term=scert+kerala+textbooks+for+class+9+english+medium PDF link annotation
    • http://polloricowings.com/uploads/files/40271269506.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/3d49245b7b2b2828a740309d8c3d4ca9/dubonijasazanogijipezewas.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/tavedujilovigetazitobal.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16097a267d9b69---nisawikuto.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/j7pj8b68r4bng5kspupn2f61dd/1821122909.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/35ab6h9kelm8390ne8e0k1ln22/nolegedepap.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/92877a5ca3f8af4963ceb8d4c79cf793/28055792487.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/1619871577465.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16089d379cb84f---favakiwora.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9524b0d5a12953929c0e2f4879fb882c/vevozi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796fcaf1642---40166873339.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/bc0957606bc17b103cb63882333b81c5/molarafezelizeb.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/puwojopigoziwugepoxo.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010262.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10262 11180 bytes
SHA-256: d693bc9d661a213f91a303c1c624206bd293646e2bbd1e6f526ab447dff46d33
font_00_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 5968 bytes
SHA-256: c93577531bb9de111096f4af54fedc2a9a6b31ed328f6522b740e00b02f9dfac

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