Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8240df1e6714023…

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 08:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a92574b0c8801a6b5f3f335fc425d380 SHA-1: e946ac1758300fffe3dfb1d9f8188d51179d5e9a SHA-256: d8240df1e6714023be7e6bd17128c3f6bf324b283226261ee0d1f5f9c179229e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farm heuristics suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=where+to+find+blocked+numbers+on+android PDF link annotation
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d6dcc265---49814676751.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e9c38a5a3---varukisufoluligurejuk.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/39796149695.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109020720301429.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4c61eb39f1dc4ec971b303eae2145a2a/21705692168.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/80188258512.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/fatenemafiwemo.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/41399726543.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/65618046320.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/70379747796.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9ff4f1f3---newezivitefedanajufaxomug.pdfIn PDF document text
    • https://durimawar.com/contents/files/nejilom.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/19858227561.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/36225957782.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/11599225608.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/0fglvsd7pgdororr2dmjslpd3s/11515741603.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/nevopewen.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/62520521671.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/pevefirusexogexupur.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/befaponijifaduzasutefam.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/julisa.pdfIn PDF document text
    • http://rakuteriyakicanogapark.com/uploads/files/wonumikuvugugek.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210921182502_gbo5d9.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/35302139988.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/regalinaxuvofom.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_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 11068 bytes
SHA-256: 55ebbfb81c7fb470c9df0c62ac028cf9c460fe05fdcccb1aa8c917dbfcf7a545
font_01_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 18372 bytes
SHA-256: 4807c5ad150fcf6eafe75b5b57ae446390cb2420dfec4d57a58c50ed18ca4ec8
font_02_sfnt_off00013017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1