Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e7d3a4ba9a3418…

MALICIOUS

PDF

77.4 KB Created: 2021-05-22 10:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99a01e91f47a46c6c486f7b6252e500d SHA-1: 8562f6f2434358e3754da4d2776ff7e3eb28793c SHA-256: 66e7d3a4ba9a3418a5239ad1f16a07732d716dfbc8a05155e4be8259b9297c56
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links further supports the attack pattern of luring users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9752

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/p2ffsp6puqr83k490m2f5i1sp1/37126290827.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/62d260519794443e1b39f70ff875ec30/96901707259.pdf
    • http://ankurgroups.com/userfiles/file/gatenumodesoju.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebf2450a3---wejajumik.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/26534e41624a2e0aa7ebb2b8c974f7f9/borimarekibudon.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0adeb25e41---66334339058.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092310fbcbab---45058032136.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66f786836---kejuveminosabupuxetis.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd150bb06---29009282964.pdf
    • http://cleaner.pl/userfiles/file/jerozesitodoxusedibawi.pdf
    • http://macautemple.com/userfiles/file/lavepogi.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad4f0f36f---posegoj.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/08099f35feee3e39ef48da42b0ae9b39/temipiwukigi.pdf
    • https://poolpoint.be/uploads/file/76007613582.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a57cf58c75c---nusilit.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5187528083ed031e64fa1a811da6b750/jixarema.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=xfinity+x1+remote+user+guide
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121d8.bin
b0290a1c683b75afec34d1bd6d4d7886a252cb2f406f97b0a42277da45807227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 5068 bytes

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