Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1816a57a8339d4…

MALICIOUS

PDF

64.0 KB Created: 2021-06-19 20:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 710c64b4e4a5bff1f87c4a1918383cb2 SHA-1: ea2530ea985be378fb7c1bb8b2b37741642f76b0 SHA-256: 6d1816a57a8339d44232eb393f8263afd41521a05fade42d7f3b42dde1b4ac5c
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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 http://nail-free.com/ckfinder/userfiles/files/98926265477.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/eq831jj1rti9dka3a05dns2fg2/42073152385.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7573cb010---38065116846.pdf
    • http://angelescare.com/userfiles/file/bivojilosarexo.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f181f645---tesajazidov.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44f17243a7---2966666838.pdf
    • http://sys-svinding.dk/userfiles/file/totatodusigugazugejetu.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adce317c441---81688447966.pdf
    • http://fsoa.cn/userfiles/file/nexiref.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ea72cbecb74c018124868651b141d093/liputixelutura.pdf
    • http://orchid-daikanyama.com/userfiles/file/72464342731.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/cecb066e33ee99f0339a709433c6f18e/zenirumawinoxi.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122c7a7383---vezapetefije.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+cute+mobs+mod
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d53e.bin
1e8e4af642f8b112eafaa255f685a257dfc1d21038c32e7f65ca440927ea7518		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 5280 bytes
font_01_sfnt_off0000e71c.bin
13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 2092 bytes

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