Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4c383dc1047f56…

MALICIOUS

PDF

70.3 KB Created: 2021-05-09 03:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e92617b0a28600e389bf2e549ed6768b SHA-1: 2efc40d73949847834db9804b43f856c9d6282a0 SHA-256: 6b4c383dc1047f56fd0e93038eef8868f5aeb52a191b699eb5d9f8f0f780e282
154 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8179

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://pixomot.ru/uplcv?utm_term=19th+amendment+to+the+constitution+english+pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9182bc21a21299b9eb7f3031b8062e56/lijozenepilesakusi.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609719df943fc---14196990041.pdf
    • http://aucoindeshalles.fr/menu/file/fenegakibigulupunuka.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f29d9b7bbf---71906015937.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160898e4de278f---86556502508.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608acbfe5046f---lebazufozovafetanumixoke.pdf
    • https://amitadevnani.com/userfiles/file/54174178396.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2c8b79e0---99424154429.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8n9gumps03hh3tegfvlb8rt4t5/filivo.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8620e031d---viwiwaxivojulimorigufag.pdf
    • https://agentcctv.com/userfiles/file/tewor.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1031c86e93d292720002b43ef3d2163b/pogometowesepisomine.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822deccdc97---43999933144.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ce115f2c---xasegusegewumokedesodi.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a6a840154daa0bbf3b783b3107310d90/mikidakobavapometopafomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8af.bin
3a98d7b2d3bbc25d6a6fadd69e89c7b86941432a2b3efc0680b148cb7b76ca9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 5584 bytes

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