Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8227331d5fb647a…

MALICIOUS

PDF

105.9 KB Created: 2021-09-05 01:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87a0dd9e74ef7a9b6985ca1c84285100 SHA-1: 4708788063debc6866fe9642c9f0d0b19ea08b6a SHA-256: d8227331d5fb647a7ba454c1959969043749345252da1ca6b3fcbdb9f7fa4fc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest the document is designed to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=inferential+and+descriptive+statistics+worksheet PDF link annotation
    • http://mppscstudy.com/admin/usercontent/file/7601365321.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073be6082bf1---raredomisumid.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5e02e07867aef13dc66933a5fcd521ce/pedugadawisula.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/60b0e1c8594a2db0d44c5b9e621deeea/moxewakos.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/47679274696.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160844048dc93f---maxubujuwigimirilapabox.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/12745292475.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/41761894829.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/82690224635.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/m1e38sgvt2cva959guensiekfe/1561761035.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210814010606379.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/31799332223.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/8b04fa3d5dd705bb9b15e0d367448340/fonigepuzafutolagefijopal.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d6d70dc32---37089379772.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a29ff581509---58165496577.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/guwujiforeput.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dkqjgbv644vcp4l17ed75s5dp4/kegeraj.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/2p7cl0adf9gv5s7sp7nq27t47e/nogelisuwixiguxage.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083343dc32bd---pewuv.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf8b89243---78653497680.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/gimegaxovufagubonagakikan.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/79372517597.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e9c9b027---kividuf.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/jonija.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ee4ceb07c75b58088a111e3381bbff20/lovuluwonebuwufesisov.pdfIn PDF document text
    • 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_off00013495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13495 10912 bytes
SHA-256: b7d753e8c18acb25725ddc4e867e75ecaa1ca41054b08d24ea693701df8658bc
font_01_sfnt_off00014dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD2 19580 bytes
SHA-256: e8ed379db717cf585b3a5c2fe306a9a6bc2fbe7bcb596b5a24b4fdc8d2a3abba
font_02_sfnt_off0001810c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1810C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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