Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c27c382674b184d…

MALICIOUS

PDF

102.6 KB Created: 2021-09-06 18:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f92dd9461edad3010e564c724e4ea434 SHA-1: f3cb3e846cdaead10321f4986706609644114797 SHA-256: 5c27c382674b184d3453bf87274e64fa5e14931de50191d68d40cddfa9ffd756
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2624

Heuristics 5

  • 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
  • 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://kfbi.ru/content/file/rinatotuxitibesubevi.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/420c5aaa079376ec894a8bed141926c0/19413887378.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///worab.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608072ba9cef2---tofutasewovowenuzewul.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/48721436449.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/feneralisemaxuleguw.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bfd41daedc---gozozog.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/buzimaberatidaxelunadil.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/29e05e7fba310fe0cb2ffc2d7465bebd/detamivamerelaru.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f557095c981---zetitejawagigivapid.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/91398901083.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/0jhkrchg96coqkkf0mg3os64r1/21989320587.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609774775f97a---sedusometatofifazetat.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/nivirugul.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a53006501f9---97709516756.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0a321d6c---givamagejo.pdfIn PDF document text
    • https://geniodelweb.com/file/13294408604.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zeditubaga.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/jilivuvadetalaba.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/sopigivotoj.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c894b64ced0eb4e613d1e2e96b488832/39071471496.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/3885464396.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/93038184554.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/86998726651.pdfIn PDF document text
    • https://palet-school.com/files/files/9846855956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=como+resaltar+un+pdf+imagenPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDF 10972 bytes
SHA-256: ba940f54c28e0d90ab08eb484219fb4d62a3b0fce423cbd3ca1514cfc5c6861e
font_02_sfnt_off0001691b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1691B 19988 bytes
SHA-256: 6b2bedcceb709ce26852a585721694f3ffb6a3f76930d633233cb2f4ea9db5f6