Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21cc53cefb39f33…

MALICIOUS

PDF

67.9 KB Created: 2021-09-09 15:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8753091b94ea9a8ac9e24f34cd69b518 SHA-1: 09f1c6f6fd2642dba05f1a5170c97188a3d2925f SHA-256: f21cc53cefb39f333d47b90b0a2a7c237255de6b076eb8e86f0c5f420650f587
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised content management systems. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the heuristic firings indicate a strong focus on URL redirection and link farming.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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://laborke.ru/uplcv?utm_term=harry+potter+with+subtitles+in+english+full+movie
    • http://malir-naterac.info/UserFiles/File/25637855960.pdf
    • http://shyjjc.com/v15/Upload/file/202192325392028.pdf
    • http://cauthangdep24h.com/upload/files/mowozemiba.pdf
    • https://tese.in/ckfinder/userfiles/files/fopupafati.pdf
    • https://zmiz.hr/userfiles/file/81242392938.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dc36c70612c88553c137155c057edf89/zakokavovitipazuxe.pdf
    • http://fratellibeninca.com/images/file/82452189668.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdde938bf---28550546452.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ae39f47fac35460c2c630c0b9f9220d0/42741487475.pdf
    • https://wct.goldcrownresort.com/magazine_files/files/24795693369.pdf
    • https://jamurgoreng.net/contents/files/nilozuseno.pdf
    • https://texigo.tw/upfile/files/2021/09/07/xesofaniguxujumijababokus.pdf
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/nujok.pdf
    • http://clingac.com/d/files/lamunenakanaminedapigul.pdf
    • http://gmicropilotes.com/uploads/files/gisajenobesaxadadatiweleb.pdf
    • http://hoya-system.com/uploads/files/202109041211582059.pdf
    • http://surveycook.com/upload/tmp/202109/file/45251401724.pdf
    • https://9ja-bet.com/userfiles/file/valanowepafalugozime.pdf
    • http://austria-ex.com/images/blog/file/lifalofi.pdf
    • http://adec-interiors.net/Uploads/file/sanexuwidorivenujezidux.pdf
    • https://yaofangpeixun.com/upload/files/jazur.pdf
    • http://brette-animation.com/userfiles/file/75655274076.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/vanebesaveta.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d46d.bin
a9392dd39bff3bc9556b75ae8197571b88a1fbf67ef42012f56278c1b14f4c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 11304 bytes
font_01_sfnt_off0000eea0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 16792 bytes

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