Malicious PDF — malware analysis report

Static analysis result for SHA-256 098f33fa64803f3d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 16:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c5a1e2ef09a29fecca0ebd5f4e920d2 SHA-1: f2546e088955f4b2596cb442a700a476c6d9714b SHA-256: 098f33fa64803f3d710f4f8a8f43c64583769a7a419a48a95a8529938a4fd846
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://holocaustresearch.pl/nowy/photo/file/tuvatotidarugad.pdf In PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613742c9a8d9d---21314079299.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/35762797272.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/kefepolururupetisebiraluv.pdfIn PDF document text
    • https://kiptep.ru/file/likifuzimejunemokemipuz.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/fuvejumajobu.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/gofumowenewobanibenuwut.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/97791685004.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/03/45508438105.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a85cb199---48489708736.pdfIn PDF document text
    • http://www.moyekolodin.com/files/84961380309.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/pejurotoso.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/giluwarawupoz.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/viwogutovujulezejavax.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/kigetul.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/82428086724.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/33190947550.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/gofurilegilesozaforasofuz.pdfIn PDF document text
    • http://anpo.vn/upload/files/23058652902.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/papubefo.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/fimediziniwogefunuxefil.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6eb61cc40---48184214916.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/34494729831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=find+arc+length+of+curvePDF 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_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 10732 bytes
SHA-256: aae6899477c0739ac1f6dea0c8c8b75c3d62218531393a71f50cf32472393edb
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 18288 bytes
SHA-256: 3ed1d5834de38739295b60feb421eeaa031bc61a5103b13add4e1de77f1e0d88
font_02_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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