Malicious PDF — malware analysis report

Static analysis result for SHA-256 2decd9dcabdf0f04…

MALICIOUS

PDF

98.0 KB Created: 2021-08-11 23:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73d65d35b5f5e8999346f72428caf8af SHA-1: ee0ab60577f405af3169f8c56bb42b38857a2f16 SHA-256: 2decd9dcabdf0f044d5a556810d945bec69c129130d5f638f92043af404313d7
96 Risk Score

Malware Insights

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

This PDF was flagged by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to host links on potentially untrustworthy or compromised infrastructure. The primary goal appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

Heuristics 5

  • 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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d3fc2f9579b4664967c4323f8da29f8f/44209135896.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df4654cdf---bawijiralax.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4f30a2bb9ed963f7809ab95632621ab1/rojamikaletugovaz.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4736461450045de4f8134b98fc3d3315/96628456761.pdfIn PDF document text
    • https://artbynela.com/uploads/file/lokamujufovusoxa.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/76007483312.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/pozafaxazuxagulatafusu.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/gipelejaranezanubudu.pdfIn PDF document text
    • http://veitali.com/upload/files/99865066544.pdfIn PDF document text
    • http://screen.by/images/file/89394669484.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/78443621278.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210707113556.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077090a6de74---70529560507.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a19103b7d3b7953646443bf6e50036d/wepovinixelenefapaxakew.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/31572402534.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dfk61cf6fe73fnrv73s8uhavn4/fopikimososuxexipul.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/33241882364.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/12148087894.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/86150638183.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/xarupofawamujijeku.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096ce6912622---dufasexusujuvoxudadaz.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/9896548434.pdfIn PDF document text
    • https://securitydm.com/slicice/file/xusudexe.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/poxiruzosixuluwop.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/saberob.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba16f250d3---11565481520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=%C3%B6deme+emri+itiraz+dilek%C3%A7e+%C3%B6rne%C4%9FiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 19324 bytes
SHA-256: 6d32d8c2fc50b9af3c9af61d826f8945a67845d51330a9b6969d87c0791f59bb
font_01_sfnt_off000128f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 11044 bytes
SHA-256: 031ad89add4cacd846390fa0829e5cdb730649a330a3f129fdffc0cfdacd5a82
font_02_sfnt_off00014220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14220 9164 bytes
SHA-256: cca2777c40a1cd82aebca938c773bf3b23bb417e79f4a8fe2febcb740fcdffa2
font_03_sfnt_off00015f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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