Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0c4cda1baadb3c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 09:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a17345043dd4e4c96f78fb45447c85eb SHA-1: ab5f51adaef5db091021ccd1f90f9ff2c6463e85 SHA-256: 5a0c4cda1baadb3c4ebdff46fda10cc0e120c98ab40aef93b3d49af48bfc3451
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external PDFs hosted on compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of multiple compromised CMS upload links and disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/9486414995.pdf In PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9e492e4a9d116313aa5c384012229d14/nadipiworawikufa.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/bixakafum.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614358b87259b---bafum.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/vutidutafefuxeretolutaras.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/fifasapeta.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/kelukupuwalazasuja.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/27513521959.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/runetojazibevov.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/dubumaruvebe.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c46ff0f9e---37789745617.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/katinawugipepideju.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/79044830518.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/vixofazuxiduminotododeb.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/37664674280.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/fotadofedixigis.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210914_102511.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/55024884075.pdfIn PDF document text
    • http://xtra360.net/campannas/file/81169127392.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/mazegabu.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/suxusoberoxugejaxunemuli.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/21335679187.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/38051906140.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210917_F7CAB6AD3C509AF2.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/wejolebogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chemical+equation+for+photosynthesis+and+cellular+respirationPDF 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_off0000b989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB989 15980 bytes
SHA-256: d272782d49e0b2474e73623194199404128eeb64c185abd54b0548b5265ed9fc
font_01_sfnt_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 11276 bytes
SHA-256: b161248065fe861a86bc51f1aba8a77bd2ec7ff01a76d3ddbd47c7f98ae8b07d
font_02_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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