Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e8a3bede6ce2e0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 18:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 412fd2f8d95bd21befa20b8793e9743c SHA-1: 97cddf5d8e0607b5542c4f7b81b04b9bc2ddc77b SHA-256: 09e8a3bede6ce2e0f0c48e17ed0c4081a7ca95a66dae39da2c0d65842add3d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d699e077---netuw.pdf In PDF document text
    • https://forthepeoplegov.com/userfiles/file/44251567555.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/gifado.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210818211336.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/37042384751.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/lakawevafoziditiranuv.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/b487a1ac85170b3fa7b24924c8c927e3/33116416897.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/90953836986.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/jigubusulonigizoba.pdfIn PDF document text
    • http://ligneus.hu/upload/file/64283565172.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/vapagisipafilab.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8924df4226---1638917812.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/29615938366.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d164408cc7c5ebe43384801b553aad10/morujuwajukawa.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/mitakinupodujotajufotof.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c86f6a17c36069b9ea4c1622c5b8c1e5/79476728709.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161063971808d9---rovujobebuti.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ss467iv360nk360vf8a51ke2mf/16310875212.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/82519976850.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9fd6e5641233e12454f1e31f4ad416ee/musovejudiwijok.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/dixelavaviladafav.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acdbca53d7---44144263987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=elekta+mosaiq+user+manualPDF 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_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 18712 bytes
SHA-256: 8e323c934f939c34ef31103939c81c658d98914e98e1ef8aa271a3b7148d0381
font_01_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 10592 bytes
SHA-256: f7bfd7599e9fc27e9d2e75102ad9784e332d0cf66790ff825ed5dcf411c82df1
font_02_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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