Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ee4f47ea762a22…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 10:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31e634769100433c490d1e09410ce884 SHA-1: 88cde44c6bc56e2095fe91874edaec9f2c34f595 SHA-256: d8ee4f47ea762a22686d70f84b460298edbdbf4d86d060f562d8d28a6854a179
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. The file's structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pemaboutiquehotel.com/assets/userfiles/files/41509043340.pdf In PDF document text
    • http://www.look4job.gr/images/_user_na/file/58181373913.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/26433072260.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/loxen.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/foleg.pdfIn PDF document text
    • http://cochemical.com/upload/files/59601928361.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/zirefojetekovetujewe.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/pegupewaragewewukudofowu.pdfIn PDF document text
    • https://ksuskalology.com/images/file/xiked.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161441052bebc8---50656684103.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/25276191801.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134a62603c7e---durejinagejadavikodawopo.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/gexosebopowujod.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021914_95751_869.pdfIn PDF document text
    • http://ropesadventure.com/d/files/69373456900.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///55696173797.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/dotidadob.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/15389694688.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/87016726503.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133613106bb4---papilij.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/12619876405.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399928aa10f---nuguvemamakorotep.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/xirufaduruladokalef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nursing+foundation+book+sister+nancy+pdf+free+downloadPDF 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_off0000b943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB943 11304 bytes
SHA-256: 695d7e0213a6c445967d075e8ca2c621e843eef99665afb65e68fb0d37382762
font_01_sfnt_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 17520 bytes
SHA-256: a02aeee786675aafbf9944aacb217e2e33dbefec06d5848a28fe8c89f5a11d62
font_02_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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