Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa09c682cee83f79…

MALICIOUS

PDF

81.6 KB Created: 2021-08-21 04:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ba31e462c6f992feb15d1bfd10128e0 SHA-1: 4f6ba810a40ad427ede32d02ebc0699248122c69 SHA-256: fa09c682cee83f799e19789abe279403fa0439110dfd94ff74db6e5316caded3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDFs hosted on compromised CMS uploads, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure itself may contain malicious JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d831c689a8f1b65cab1468ce1bbdd0bd/71812383901.pdf In PDF document text
    • http://fotografieindex.nl/images/uploads/31828461552.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f459d740eedc782c7b39e6966b7a54f7/tubovi.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021061916534873499.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labowefofekefozebaw.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4dc9db72a---81784081965.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/saketila.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/36796163836.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ee74e343a---fetimusevupubebel.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/wodabubebukarifir.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608523312a973---dizozimetin.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/73225746245.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/fajiburi.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f1b502ca---3587675951.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3cgqd2sdtgk0k4dch25vk4rvr2/63630680410.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/b2a39d9fbdf1601574967104aa4abe8d/61298583298.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/nemujenixaken.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d19513ec644---63310089396.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088758d31fab---jefates.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/92118312878.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/93528262969.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/42ec8e76d8fc2aab4ffce5ff1c9b2071/bogidumevulaxivitose.pdfIn PDF document text
    • http://patroha.hu/file/39159646649.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sufesuril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=types+of+delay+analysisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000de20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE20 10372 bytes
SHA-256: 02aaa45f0e6b5f2988f0b7f449cdb414eff358e3e60f27ed26c4110e5e84195c
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 16296 bytes
SHA-256: fdbea46d7069d97fe07e86f1effb529409d020f0eb61dfaa84da55fc27507a54
font_02_sfnt_off00011fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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