Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f25c588f98e4d8f…

MALICIOUS

PDF

63.4 KB Created: 2021-09-18 10:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ff2a402b9b6507d070628cb2c65e227 SHA-1: 32c83963e4b60d411a5747fc11a4af7fbd560684 SHA-256: 4f25c588f98e4d8f8d6be5edd1bb12665972ba200d6e88adb76e6f7f79d3adb8
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, with numerous embedded URLs pointing to various hosting services, some of which appear to be compromised CMS uploads. The primary goal seems to be redirecting users to external sites, likely for phishing or malware distribution, rather than displaying meaningful document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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://chuyennhakienvangvn.net/upload/files/4971774956.pdf In PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/befobivik.pdfIn PDF document text
    • https://sadex.pl/fck/file/74041837424.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/tiwepenikunufirovorej.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/80847727221.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/sewuzid.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210916062917.pdfIn PDF document text
    • http://arablift.net/userfiles/file/nabevopekakinurekumo.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/59348080603.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137d174a1f7e---53275478401.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3e46e44f6e063aae08e4a3a4e2bacb1b/74278652174.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/69333424146.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/44707796187.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/3478579129.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/13020305112.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/79583136778.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/98223945313.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b6a070152548d5a9352271a0a9f1016d/dilojomupebefujazikepel.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/35447190113.pdfIn PDF document text
    • http://chpcentre.com/files/file/9226336158.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/getebu.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/suwexitetibib.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/34509637892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+adventure+games+play+storePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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