Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d75b59c30fb22e6…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 21:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 387f049bb8f9ddb512e60a774506a296 SHA-1: 9d2bf1ce09683aa5293918fb14414ce46b6cb7cc SHA-256: 1d75b59c30fb22e6681ef13004da78c85861b38a449dcbc04a084ffbde2ce898
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of numerous external URIs and the 'link farm' heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nonbodepsg.com/uploads/files/3095668370.pdf In PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/vukanev.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/bimufumoxoretamotu.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/33938381559.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/xofuxamoseme.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941de56f85c---417160014.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/26vil0dfeuir3u6d8qm93rrlfi/24973650873.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ade18dda6---17707513140.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/95199983802.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/leviveruxolon.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd77ddbafc---kotogipuwezer.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/64183440966.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f72fdd63f0b5edad30064e655033f731/guneg.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210727_6F19978B0ED62609.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/zarakewifebilisures.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/getukuzevives.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021063005304170554.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9970a0c2b---sitadowef.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611be5a26d409---26401904687.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/22658003741.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3fdc81624---77001757228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=vertical+marketing+system+pdfPDF 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_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 11016 bytes
SHA-256: 57e071ca051a4d209801b214fc319f493e0dde5c0b47b5d320fcc8c13d2e7a5a
font_01_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 16592 bytes
SHA-256: ea745b56eeafa4b323189d0f7e5a5220b04d7f9a4cd9d1203035090f8cc472b6

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