Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbeaf253e469c31…

MALICIOUS

PDF

85.5 KB Created: 2021-09-23 15:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa4876da7b738b51533d71862e53d699 SHA-1: ad76683baae87d3c1996987f2d5a965aecf25285 SHA-256: 1cbeaf253e469c31d142f5f53ea470b30be2cae6b24c9ae551a236479debd0c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of these links and the 'link farm' heuristic strongly indicate a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613477dc788f3---66730854941.pdf In PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/nodazurebamevewubof.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/3466376331.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5098c0d0---13165206394.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/85265350753.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210913_CCC85D1FE4A8E7AE.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/wezipomajufawofusapapuli.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/7637339932.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/94136601504.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/xiwodaletulumosaluparel.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147edbcd944f---46465661521.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/dizomegixer.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161373e2a103bb---vozabusa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2d4d96cbce786f269831bf86b1f86a34/dakagekirumeliwebofasot.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/ba638e.pdfIn PDF document text
    • http://canadanur.com/resimler/files/negupodatubin.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/55890885503.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/vusulafomotibikanokemepo.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/67827799814.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/wemozanexalekarofaje.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/kibujugigijav.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/36962803215.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b21e543ff6---kekug.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/rokosowef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+one+icon+packPDF 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_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 18868 bytes
SHA-256: 5f6175c08502d6f8208957c1cec1cf6c82b88aac2cbc1c7c2ef33f08cd8788db
font_01_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001318d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318D 10268 bytes
SHA-256: f6372e6c175e979626d39f5897470bd9824472badbdadb0ced1641ae8f566a80

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