Malicious PDF — malware analysis report

Static analysis result for SHA-256 56add8d9805f00a8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 12:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7d5c47922d5b0b910ddd4f3c86cff34 SHA-1: 3d0003f504420250cb58ca07b0bee7edf88974c3 SHA-256: 56add8d9805f00a836a8123dc509a2db24725d3e408e40a36b6ab27c8055202f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the extensive use of external links suggests a social engineering or redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7669

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 https://synerhu.ru/uplcv?utm_term=binary+addition+and+subtraction+worksheet+with+answers PDF link annotation
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/92991bfaaeaf7ee8badad98082c26b03/45999655649.pdfIn PDF document text
    • http://budka39.ru/files/46547724747.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1716741160.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/49587120580.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/dupeji.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d098aae3cb3f916078cc7ceeebc49763/21893119760.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/sowekeve.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210803164517_lh0cjx.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0550daf24---73775729775.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160722ec763746---jiresutale.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/4a7cc693fcc1facc5e98a529d5dbb4c5/dabuwedibo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5a79299e8---laxume.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/wofejovumufobojopes.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/53462841860.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/xilakitixedak.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/rivipuka.pdfIn PDF document text
    • https://reha.bg/content/upload/file/torugogogogogoreba.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/mapomasifesoxome.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210724_361B9516C5CC8E8B.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/13550235054.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/10379508803.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 18104 bytes
SHA-256: 612fe3527113bdbf7c99808e8f657095d97758fc57972335cb531fdd49dc9494

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