Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3cd32af7d25235…

MALICIOUS

PDF

79.0 KB Created: 2021-05-22 10:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eb86503e006cf6f19fa5ccd4044d9c7 SHA-1: 4de86126ec796dc5762db114de3d2b6e2b366e2f SHA-256: aa3cd32af7d252351f6319852b092805522d5dd81c411dc1dfeb83882d8a4b8b
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it's part of a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9565

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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