Malicious PDF — malware analysis report

Static analysis result for SHA-256 254777389fc52174…

MALICIOUS

PDF

55.8 KB Created: 2021-06-23 07:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8fc8b2157db1c92e46f66398c6cc9fd SHA-1: 48b2e4c8d173fced249e74fedad38d8b364c93ec SHA-256: 254777389fc52174484ac0f09e32ff3b417d29188e20637346a949bad907ba91
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8275

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://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160969bd6cba0b---17339717307.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/c700a195f7a0f10d24161ae18d78bc36/73068442535.pdf
    • http://cgl.lu/userfiles/files/88098001251.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160985a810d13b---55233090677.pdf
    • http://liddellgaryfamily.com/clients/863293/File/16336324688.pdf
    • http://riggi.ru/userfiles/file/50053243902.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p6si0rgu3g9skuv979533kor57/84587071299.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ff0a863340407f74215f6b041d580d2a/89768308326.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/bevukigimogesofupugadan.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c0ab3fff5b9dd565b5ef0eb3b9bbe556/supilivezapik.pdf
    • http://romanakladatelstvi.cz/userfiles/file/kezekuxutenerukar.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ffe3a2fd---segidekinagegojumevid.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/20794728132.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a394f224898---darigidufixidowamusufivuv.pdf
    • http://anatolianlgs.com/userfiles/file/32106931079.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wooden+sofa+catalogue+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af3e.bin
9481ee4b635f2b1547375b21281449c15d95250f91069e496f34c5b8b2205a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3E 5240 bytes
font_01_sfnt_off0000c141.bin
a5850bc183396ef17cbeeebb35a3a4c8edc278166439c971de2c7976df330fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC141 10628 bytes

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