Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce2d65cfba25a49…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 05:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8c0dac64940b996f7c378153223e6d49 SHA-1: da3b20f9edaf8097133b6d616cdc5571626e66de SHA-256: 8ce2d65cfba25a498cd6243deee1bdbcae3ddb6de592bd7f524d9c5700a1a2c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://liantoong.com/archive/upload/files/dovilumumutal.pdf In PDF document text
    • http://dylogistics.com/userData/board/file/67446291611.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/91124367819.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/xedoboken.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/93801615716.pdfIn PDF document text
    • http://birdwatching.sk/media/file/15161818352.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/monaxiwube.pdfIn PDF document text
    • https://ip-pharma.net/data/files/47651083155.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/57524339090.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/rapoxowepizi.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/dakafifasifetalobowidimez.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/1024304497.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/10703171133.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/juvugokazesexaj.pdfIn PDF document text
    • http://vhktn.at/images/content/files/96830569903.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceabe73724---93493012321.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/kuxozaxibifowutapalutep.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5526da714483772c838828b5dfdc15b1/zituba.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/gejumosanadevotiwirugiga.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/59850443423.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/dewuvesabewadibetezuluze.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/pdnta9de9erddblpbhecb6fpad/39057697108.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f558ab7c79---sikevajagafaramixe.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/pededamedo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e20975e997---bizawezabitisasegegomikuz.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/55149138923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+tunnelbear+for+androidPDF 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_off0000b170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB170 10508 bytes
SHA-256: 33f1e8667f1c648e42012bb7938d50843986d21506a834c5f9c8ed39bc07ad85
font_01_sfnt_off0000c975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 14784 bytes
SHA-256: 0a1d40a9b2aca472b1bb261b785254f990ca723728572a61553ead441cb45b9a

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