Malicious PDF — malware analysis report

Static analysis result for SHA-256 5025ac3fe6d23a3e…

MALICIOUS

PDF

85.1 KB Created: 2021-07-21 04:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c14664b83fad44f6a876a728058df668 SHA-1: 09729b74ed6789220c2c1863f89618f2d445307b SHA-256: 5025ac3fe6d23a3eefac5ee2edabf7f10f89f0517c02d812981ed5102089d456
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage compromised infrastructure. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/541e759197775e80c9ad6698041e616c/dazujopafonudib.pdf In PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/dawebemexobijudawozeri.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/vifidurozezi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3cc79afc---37647404328.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e58547568fb---pibexenebakamujozeta.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/tubajadopik.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d905e7c6b---vezesaxowukodebilob.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/2131127806.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0b99a693---kagiwonudagetuwo.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/80174181296.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea393d2d51---70744702992.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ae7a3718bcf9140cace07fa192234c42/negitefotanutituzo.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/lepegemusita.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/74403442540.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/10aea01803f240e9c3cb7a5522805965/93742857916.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/deadae1c09dc28615d3a3cf81c3d7bba/laxamirogupizovujafugiw.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/posenipawuvuwamepij.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/52532590989.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/97b160803e98c98cdd86d47428e3eab8/4390495963.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/jabetoxafo.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/tuwikorafugaxisulufe.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dc84975cf1f4e71bf4c5e15bc8dc97c3/50800060176.pdfIn PDF document text
    • http://atek-ent.com/upload/file/fugololako.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/30279571090.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/86582168501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dog+drawing+paintingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 16756 bytes
SHA-256: ec376661b5b85e3900a49c4370bed5ede7e8574b90a48611e6688b1f161cdd78
font_02_sfnt_off00013018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13018 10308 bytes
SHA-256: 68756f70322b8d7790d48c44f045806b4138046a989e59e6cbccf935a74ebf91

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