Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5eb5ed889884b5f…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 05:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29a292eae7a66a95bca1aa10ece31a60 SHA-1: 204fa83517e260c323bf0104efefdff66af7fd8a SHA-256: c5eb5ed889884b5f961007db333c54dc2e28ea1bb267cabad0d053c00042f541
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6103

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://krisoc.ru/uplcv?utm_term=level+3+teaching+assistant+interview+questions+and+answers PDF link annotation
    • https://kovosluzba-praha.cz/res/file/66846868834.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95a0c0946---71730597776.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210620_161054.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/9nie4mt6ua4ac0ai8muskuntcn/murakorarorukusebo.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/rfrdiocaprfq2sgogus46j45i6/valivowuwuvuvelemutok.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/85212526642.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/25863981129.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/rinabijupikepidimorugu.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/29510973822.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c49949f51---3718801477.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfdeb3fceb---kebumibixiga.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080791336061---38843039537.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1320ae5a54---82142477500.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0c4649c3---rosopemexanowezunex.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/pgvva8kncl0sn3bo3d74k3f56s/muribuxenesikedodufixuke.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/529b3c3a5a01d79afab772289abcfdbd/49570714778.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/mafofesuderux.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ee845d5d---75035845899.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uft5j5k36nc5fplj0l9dp46etk/wajujigeweg.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_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 11176 bytes
SHA-256: b376f68f6cce70b67673bd3c5447d9014cc336931831fdb2c412640ff2ca6ef7
font_01_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 17636 bytes
SHA-256: aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e

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