Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c028d9522deedfe…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 23:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c494f888b034e47536d03f57a2829aa1 SHA-1: 33a251477b4ee63a4f8fbb76264a897156b482df SHA-256: 6c028d9522deedfe79339ba08ebdbeafbea8d83c7a22a975b8c3fa68f0f2153a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. These links appear to form a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=2015+residential+building+code+pdf PDF link annotation
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2a212b3fc---zarituno.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef63106aba---wogidadegedorenowonu.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/44408362919.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/getodejikix.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/72f956659ec79587feaa570ac88687c5/41363244094.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/40648624924.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a7a7d516c69e8a71ccdc6130a3dfedbe/gotupirewelida.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b65026e53aa---gomikejuvenevadidijopirek.pdfIn PDF document text
    • http://hasyo.net/files/file/ziramukawanorawidowag.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/gixegavopifu.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/pivibek.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/razuxigatufomaw.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/74364902715.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eu1tj1clb3m1vqtfgnpa31eaah/94120535355.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092415f53c1e---67112422724.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c11b453a0e0---83299337468.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ddea62d9341---bodegabuwujeguva.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/50890539345.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/mawesanivileramud.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/nijizavolofova.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/jatizimibogofemuluf.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/46460955549.pdfIn PDF document text
    • 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_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 17984 bytes
SHA-256: 36ef5f4abac586083fa9fc3e870890413bf8e0db9dfe03bf028b2a57803663ef
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 11368 bytes
SHA-256: d59a4948909489cf608e5864a0e4a3e72dd871383241e8be389276efe9cd95bd

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