Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b2134ddc47cf4f…

MALICIOUS

PDF

93.0 KB Created: 2021-09-11 13:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33bc44534069bee4f00b2a2482417c99 SHA-1: b7e7df8a4b7247cce9ffb67e7c6493cbe8688ae2 SHA-256: f8b2134ddc47cf4fde5ee47019a5e75e18ef5b91e0bcd261be0f6cc30137fb4b
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 PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting a potential SEO manipulation or content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://www.naraihillgolf.com/admin/userfiles/file/51369410705.pdf In PDF document text
    • http://byecook.com/ckupload/files/babegekikonuzesi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341aae685bb---65026327672.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/58912856246.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109082054121490.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/gerosejikumomi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5cc0b6e7.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210902221125_1290661555.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/womitexefufebejorej.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/32163083877.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/wobemesadakufufafurof.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea97ef72f---bexik.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/97573672519.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/25878834140.pdfIn PDF document text
    • https://italvaping.com/file/79009781564.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/vepabefokusumu.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/nedarelevizivex.pdfIn PDF document text
    • http://didula.ru/img/file/30519162167.pdfIn PDF document text
    • http://suurelepa.ee/data/file/poramilejunuzinunibaso.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210909033441.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/50820915160.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/renewuwe.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/gejokatimapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=instagram+free+100+likesPDF 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_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 18896 bytes
SHA-256: 06d9bab333d297c92e185c1f48c446ac6be42822750841ebfb6eb0c7da96d480
font_01_sfnt_off000135d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE9 10652 bytes
SHA-256: d3abed373b91e4caee29e1afd7566042d985f16b1806bf6f1f7e4abfe78b04f0

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