Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2529251bfe39ae…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 03:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43ab2a4a97c80eb6e2c3f526aa55b081 SHA-1: dcb7b207e92ced4e2d3db11daa70a26836553e76 SHA-256: fc2529251bfe39ae37460b99697fca03052b845392b250a3a4af558f084c60a8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to external sites, including those hosted on compromised WordPress installations. This suggests the primary goal is to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://canvangdientu.com/images/file/vugabexikipuvoriko.pdf
    • https://augsburger-dartliga.de/uploads/file/tikuxewuwuvaribov.pdf
    • http://trevorhannant.com/ganudexerana.pdf
    • https://stpatswatertown.org/ckfinder/userfiles/files/rolutakivosanereg.pdf
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/gimufezuxowusoxiru.pdf
    • https://smshealthcareservices.com/ckfinder/userfiles/files/42952063836.pdf
    • http://cartonwrappingmachine.com/userfiles/file/48857619061.pdf
    • https://www.zolmedis.lt/ckfinder/userfiles/files/xafefafodekolubijunato.pdf
    • https://deesudcoolingtower.com/userfiles/file/fexosuta.pdf
    • http://naturestuff.nl/siteimages/file/98472809584.pdf
    • http://cluboutletmoto.net/campannas/file/39953232956.pdf
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/77095461539.pdf
    • http://bonezi.morefriendship.com/upload/files/31840053120.pdf
    • http://allmedicus.com/userfiles/file/78010922662.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b81601c71f---98943528228.pdf
    • http://infrabud.eu/fckpliki/file/26522984966.pdf
    • http://slovoveri.org/userfiles/fefekozozamerox.pdf
    • https://hlj-vibration.com/uploads/image/20210909/files/20210909082152.pdf
    • http://maivietnamesecotati.com/uploads/files/zadamodemirowopukusu.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161301266e08ef---zatulej.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/scjm8k4t6bhe8avf6r6018ltn0/52113082545.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=apk+nimo+tv+for+streamer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abe3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xABE3 16792 bytes
font_01_sfnt_off0000c3f5.bin
b15d3a8b6d65cd83fe6bef43971c416d52694dee3587ee63cb25eab5ac402f2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F5 16244 bytes
font_02_sfnt_off0000eda3.bin
0fd6c3801b7a41c56b805204b72eea7d341e0efe05253cd08b9e862ca2e1745a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 10612 bytes