Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26d03096f8df3a6…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 21:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50c8ad84b0926e13be89f02396edfc5e SHA-1: d81197a92774794211f248600fd0be051abb4ce2 SHA-256: f26d03096f8df3a654b97463dbab8eb93fde09fe6ba01060b155461f91eaebe8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://seoulgreeter.com/userData/board/file/depebilozak.pdf
    • http://ruihuitax.com/files/file/89569407600.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/15895897460.pdf
    • http://master-vin.ru/files/file/nijobugowojiri.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e76c2dbad---46728054150.pdf
    • http://ecilingirler.com/resimler/files/ronebakeradododajale.pdf
    • http://radiopoint.cz/userfiles/file/56314839423.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/zazal.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036cde659e---lufuge.pdf
    • http://www.binghan.my/userfiles/file/80504075565.pdf
    • https://indirimlipin.com/calisma2/files/uploads/kowira.pdf
    • https://wfbulgaria.com/uploads/wysiwyg/files/42262974243.pdf
    • https://rajakedua.com/contents/files/jupofenawasojo.pdf
    • http://toroisg.com/public/images/files/gidotupanufat.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/886322c28699661f7be2c909e69da2eb/32104992144.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0cnjf5uu46pl1v80gumn1706lj/zibulovabetim.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313845a543d---vonuxoxeli.pdf
    • http://hockjoohin.com/admin/uploads/file/88577378856.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a2872780---70124846370.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/59450429162.pdf
    • http://ipai-bg.eu/img/file/46793078709.pdf
    • http://cancercareresearch.com/userfiles/file/74266159842.pdf
    • https://condominiovillage.com/userfiles/file/76758875687.pdf
    • http://ahkjt.com/upfile/file/samabinejebuvaneru.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7f1a442ae983f541b53835543c842a17/30613599132.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+android+emulator+for+gaming+windows+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 16792 bytes
font_01_sfnt_off00010fff.bin
2bde482c683088682251bce9c86bacd03b6d6898542bc3182c9cb3dc68d5aadb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 11112 bytes
font_02_sfnt_off000129d4.bin
52de704e98663d4c01065f4cb1116d1154db5ae443e46eb6e5d468726ea827f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D4 17520 bytes