Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fc8ea19d3dbd8b…

MALICIOUS

PDF

203.4 KB Created: 2021-07-13 22:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6efe9c24ba85de431a5c308d23c02725 SHA-1: e398a5a4f24cd4e56d578568d1076efa7bedaec9 SHA-256: 84fc8ea19d3dbd8b1b28e16920ecfdb09adc498f7ab50e49c9bac940b82d6847
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting an attempt to host and distribute further malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically indicates that the file links to malware hosted on such sites, likely to trick users into downloading a payload. No scripts were extracted, but the overall pattern points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9707

Heuristics 5

  • 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.
  • 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://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/92s19j0e1vcpioss7ne265dgnp/21268169175.pdf In PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/fujalavevibivaru.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/fixef.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/32n60h6hkta8aip3ca4htg368v/numowezefodotovamene.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96036f666---tatonatupubedidokulifoseb.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073be0ce47e2---rumumuxiwibasumil.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608566d49e399---rogirewazopuzemupokir.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/wuraxiseg.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f5a34e370c3e570d4f687ffbdf2f2b74/tukuvometimitobamafugav.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/tatafalukavojumevafukepiw.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ce18c12f4---49991026623.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/25d031b2823f865cc6438735fdab9851/70265014548.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/19512639814.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/fa42be6abca42c83226d9c53aa30bfdd/74837911452.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9580bea62---66252911817.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pnblc7igl3clgtj81n6hf5cf67/89464034642.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/62168786141.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/nujknd7vd88gn9gq9dkptikh3e/xuliselasub.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b88a5d1ac---kutebovekebotol.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/34982725568.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc133d16e5---rufowuzoxidebebazuzuruva.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/v64uv4v2t5cct99trgmgh67s87/dopikotozewemutuwuzijud.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/dirototilunepibunemeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=covalent+network+propertiesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4acb56dd3fabdf9dff78bd072788fdc6/71382218526.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_off0002b642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B642 22844 bytes
SHA-256: fd2b4fd4206d0a30724859227255b2f3b2a7144fa0a6f10745d4803eab92f96d
font_01_sfnt_off0002efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFE6 10520 bytes
SHA-256: e650d176836b73357acbd1ea38e1f35a4a2f5e4115f911de8f8f4c94d9d98083
font_02_sfnt_off0003081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3081A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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