Malicious PDF — malware analysis report

Static analysis result for SHA-256 02caeb8c28db898a…

MALICIOUS

PDF

83.6 KB Created: 2021-08-30 13:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8b62d9d42f38b67887b8bc46e6dc924 SHA-1: 31b38c76514ccc0fa598d728ab3641fa5c32d422 SHA-256: 02caeb8c28db898a19d3d58fb5838ce320c676540eca159dd96e0c2b452792ac
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the presence of embedded URLs point towards an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://hearing-outlet.com/uploads//files/202108031313267739.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edd9646e3---51025624070.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/63461673567.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/22095803525.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/53926242673.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/886c9105561495f534af4450b9515a28/bevole.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/97267519059.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/43036594132.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wusowagoxusibewo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f81c2318---wimosumevorij.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/14134971252.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/89435764833.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/vivale.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/3294044783.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/21568861785.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505102823.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c113ed3f1ad17a94034cf3c9ae61edfb/norebirigalaborasidov.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/vowibopewowakusobud.pdfIn PDF document text
    • https://aedwea.com/upload/foto/seluzelazuw.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/18123044683.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/dsvtoucd4a46u11eicupgfjqn0/bunorulinotomareligipuvog.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bevezug.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/xatolowubewewajuwireseman.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/20365003238.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/rugokiragawizonon.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/547340429.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/14227323878.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/gisawewabakakijijomit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hst+on+residential+propertyPDF 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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 17616 bytes
SHA-256: d0b42773909b98e0466bbb15930cad78488818c132f6e09459ad4fce8496740f
font_02_sfnt_off000127ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FF 10488 bytes
SHA-256: 275a20b27198c0c1306fdda4086f4e824b620c14da0a8a2d8b797d1e38e6c4c4

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