Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff4b6cfc5c7cf2d…

MALICIOUS

PDF

78.1 KB Created: 2021-07-15 19:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ad51dedcb9f53449708bc247f512b7e SHA-1: cf69ca1b8cf167d544edc84528d9acb4ec979f6f SHA-256: 7ff4b6cfc5c7cf2d2b03a735ea2b12ed11fd449170d41a9f0177fc778bef0c63
154 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely to facilitate phishing attacks or malware downloads. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5624

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://nomylo.ru/uplcv?utm_term=5+june+star+sign PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ece6a8b2253---91810121487.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098864b45172---rukudobobizezejudo.pdfIn PDF document text
    • http://adveotec.com/img/file/bidepuxegidezatu.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/vokisotatamuxenotojedud.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/dajaregikasi.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/51880306789.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/46117346557.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad93194b8---magezixoniw.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/34e624a75b87789e8469df38fd14556e/jezudobumifebukug.pdfIn PDF document text
    • http://beiks.info/public/file/41802097734.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/49313757170.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9dab7090fda90e030a6577fd23afe95c/46900004592.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d507995025c---wirogazomagolupatexatiti.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b65b21eb5e888435ff171b07719c08ff/90949205702.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/7e646a5ad6cb6f63b8e1d1f0df127281/petobetulobanageka.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/kuvosugagubozubosititer.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607216adc4960---65669273639.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/suziduxasuxivaves.pdfIn PDF document text
    • https://eminesenlikoglu.org/resimler/files/digosanosu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/56946420132.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nlqs3kc1pa7ndq51qnemo56mi3/17109845468.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/94894863992.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_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 17888 bytes
SHA-256: f60a4320dd73eaa867e35804301d012c3b8af83ef0c4c262f1259e5d588a56d5
font_01_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 10384 bytes
SHA-256: 9647c8ffe56dceaae0d5597f74488934ec69b3adc9b4ea8c4ce88c341e903991

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