Malicious PDF — malware analysis report

Static analysis result for SHA-256 83678ccef46039b7…

MALICIOUS

PDF

61.3 KB Created: 2021-05-31 23:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d89f005ac8fa8a80d009da8f61de01d SHA-1: bd6551e84ce3b96848951114936c52704e041e15 SHA-256: 83678ccef46039b7718a8b6f5c0b64bf51596bb09fbbc205195eedc9e45cfc59
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

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 http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/78d32bcd80d81790f37df689481bbfb9/pitafokefuwasimevoxuluk.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vosipurowanoleme.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/3fdg9hkldoqi97it0vh6iai1kp/figixuzuxigol.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160967ed76c1e2---wusinokumu.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e66845b5db5bb74ad8b6e2644e66f8f1/mogifofet.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/52370810022.pdf
    • http://ajivikafinance.com/userfiles/file/24770386653.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210531014836.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160805d314754f---36626996308.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/69257801511.pdf
    • https://abofahed.com/userfiles/file/77326406915.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/norejamidaxuvikimawu.pdf
    • http://adabaskimerkezi.com/upload/file/kokivab.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a5a64313e29d86137e9724617cc1c501/80293953237.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6b11e879---32449256125.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775f70bbd9e---dusigab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=libro+piense+y+hagase+rico+en+ingles
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d342.bin
150b636a8b9903344a916aad8d3619d62aa1303f2b7fb2ac7fa53b1f06975fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD342 5380 bytes

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