Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65f7cc69bcccfc0…

MALICIOUS

PDF

72.3 KB Created: 2021-06-26 16:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c88f4bca4556d14d8b992b860ca49ec SHA-1: f1c29424f50391d953290dbd16c8304a31fa4582 SHA-256: d65f7cc69bcccfc07c1152e9f46e193dc567348cd1c43e7699a916cc824cebe4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/5375a1f147a46136ed21f9ea627a1250/nejikivogufujezovesa.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1cde698b769bac8f6c3d00e563635f80/poxukepemom.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a67179801---40441385156.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848abe64c83---70196695554.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/pexaz.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf65ffd1084---tasizasosusopewogexomixo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6518e83ab---toniwibij.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/94446569510.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607643c7ccfa0---felexujegosaw.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca2c314629---47626833333.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6c838905d---suredodabufadokifezenewer.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/dab7e6703230cb41a6b9505be8aeb028/bomogeb.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/m8gnf6jvfv6322nae6qlre3kr1/62981634386.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/luketivuwokinu.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/wuputikojenopilefimalogi.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/saxisegegaguv.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3ku7nllucbs5sld3tcfg936ioq/51340109138.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0e84cpdgvdagaalts2q8bg5er1/90035109379.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b58d3135a93353413dc6228777f366ec/getinamuw.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/zolodilotalejixotakuti.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94de6235e7---luzuletakuligu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f230a3a1e6---veweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+free+animation+softwarePDF 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_off0000bc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 15124 bytes
SHA-256: f8f5f76ba60fcf4a3b426af6fbabf5b60c6a0399be565b6f897c07ffc9e5f5c9
font_02_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 10468 bytes
SHA-256: ea407d210a5285d493ef243c1f9a0651dc9f511492ace0a7a0ed12298dfaf6af

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