Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12d4c31d4cf4fcc…

MALICIOUS

PDF

72.2 KB Created: 2021-05-14 03:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e44ccc160f032c52a122103cee94753f SHA-1: f3d5b6519f0b7d3b8fadaeb1a4d438be224d5f6a SHA-256: f12d4c31d4cf4fcc5c71e0e63840762fbeedb3872e8f7688fb32306b91bda6ee
154 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9795

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://naturallabs.de/userfiles/file/palej.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608029f322f0e---7770009764.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/bc005ae3969cfcf9adcb22311f7bed0a/loreropovotosipuwerawi.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da187d8925---wedavelibavusozag.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fd9dcb37---80053912989.pdf
    • http://anvlaw.com/userfiles/file/tepewi.pdf
    • http://china-hold.com/UploadFile/file/20210512210309002.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/80ptr0gqtcqdieh89luethvv93/37981535911.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/35s4sujqa5t05irsbu4lm8smm3/filowotimelumate.pdf
    • http://asckhn.com/acskhn/userfiles/file/zepetedalunoburezud.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/imvklomtjhn6h9e08d2daemnp1/gepukiziped.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5fe9g3d8pdnh7ipdn1sfaujdmu/lumadabav.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/rqjb4bg4q2rha5tkbsprdi31k6/28963226308.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=culligan+gold+manual
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e952.bin
1f6301248a8bd2502a7f5ecc76afd9fb99aa6dd6b5e5d510e7d09c0187b0502b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 4776 bytes
font_01_sfnt_off0000f97b.bin
e87ba13f9f5f156cd889e337995072e7ade6b3be774e4e2380434aeefe0c5777		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 11992 bytes

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