Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd8e9c0ddf75c8f…

MALICIOUS

PDF

61.2 KB Created: 2021-05-06 01:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b877351f18729b3bd123cff6fce909c3 SHA-1: 186fdf56c1e6b57bfb980a37658956fd69009b5e SHA-256: 4dd8e9c0ddf75c8fd6633dbe0d4ec06a26a2c54d1303b1af4eb30ab98ca48c7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it's designed to lure users to malicious content. The embedded URLs are part of a link farm strategy, likely intended to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

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.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/h7uv2e80ahhkef4bfhp57frv98/vesizok.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e6e6b362---12896071861.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c3cc4294---buxitosowepipa.pdf
    • https://abofahed.com/userfiles/file/daroporukiki.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/fc9d48c0038b41c83de6dcfb23fadebd/goxovose.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/c569u078757qg0mfoc0f1onl76/53395737390.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608483cba4877---favote.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f69d82f35d---totejunabo.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/aihva9okfqg7kmhp0s2vvaccj4/nenarosoxokibik.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6db49ef69c029d01b0eae124a691a733/zokenoji.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7974a2f8fe671404a43f10dae27e82ce/44557868743.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb0860fee---zosujugowexiwanogofoki.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c95982186---pedurev.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e19338428f0df436b607471b6d78e230/55853306973.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/t232o1u93e19658ib122fl7ic4/tuzokubalibudopi.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/l1md04nlrebgjo9o59579bmiu5/xiwagegiwel.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33e97ed5e---88597172449.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ubc+alumni+email+android
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de12.bin
bd9986d0777c186ecb08313539b3e8dc934ad8a5c67a3effaa45736b4fe5ffb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 5036 bytes

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