Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dbfe49733a855d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-22 15:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6669e15a5df8c6a7dead36e6e416d6fa SHA-1: 27e5b2ae75d0567d1d58b3c46c8a66ecb0b92062 SHA-256: 38dbfe49733a855d1e9b2700153c6f3195fe7414298f190ce91c82a6298588d9
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is designed to conceal its true purpose, which is likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6398

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://inwebjor.ru/uplcv?utm_term=how+to+change+vpn+in+android+mobile PDF link annotation
    • http://intertribo.sk/files/daposadebedanosugu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b067d0270f---54745875585.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30e04e4b68809b43849abc7b76c94f9b/tiworinowijuxu.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/mipovapawirulem.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/wazasisesef.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/finijujujubev.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d1634f3e1747c77e26eab9bd4cadb202/winubuliv.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/lobawekifekamiso.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/womelavewovikinubotu.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/savamawomugekis.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/kexivowimopom.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/judipeju.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/fodamumapuxuwaxuw.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/fudazipumogufenuwimunalo.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/48716909851.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/tediwexasev.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/45451480870.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/49033603649.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/gokesejomazasozebiwuvarix.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/92535101785.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902083617.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/momof.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 11076 bytes
SHA-256: c5f2ea5c38a68b3485ec9343c4bb0f08a33471582ae5a85976663131548be8b2
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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