Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f002c54667ad1e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 03:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ed972db3256dd29d62d0ac70544d8ea SHA-1: 3f6c2f44e7a930ee9c0df41b1ae3f4508c31888d SHA-256: c0f002c54667ad1ed3d9bfd06df6806afe2638fbf1f963fa9c56043e41040d91
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to lure victims through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lenaoyunlar.net/calisma2/files/uploads/dijuvofaw.pdf In PDF document text
    • http://chipgene.com/image/files/20210914_040220.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97e4c2303---52016405405.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/16084331473.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a369f3f2bb---movodo.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/12297381370.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/82114748278.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/bokoragamukefaxus.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/29966545706.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/3281930649.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc65ddc25---vunilima.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/wariduvofi.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/71934615575.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/govafolomuruwaw.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/makukekumirux.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/20706777490.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210913075732278.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/wunowib.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/pojekexobugikatalofif.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/vojegipapu.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/xenigolekiwunavi.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/xurak.pdfIn PDF document text
    • http://gazetavk.ru/img/file/33157303102.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/quu5arsgkoe6c9l6mah3r1ruo6/rajadujip.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/vawiwodoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lightleap+full+apkPDF 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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 16936 bytes
SHA-256: 462684828a10e9dcf53985d294041ba54c327d5a209a09d441e31b1c181b5622
font_01_sfnt_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 10296 bytes
SHA-256: 58f14b1e57e5c770a8b601c4c157c02e7b432352c72d249b75ea4f0da69d7039

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