Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3537e9921253c1…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 19:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69f30027dd0e3620870c4114f432aea4 SHA-1: c3367768845aa6b7671ff3d91d6680b93e42808c SHA-256: ce3537e9921253c1c6d96c0318a8609b7a91eea37ff83ba402ee6ee6947748e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=demon+slayer+mugen+train+full+movie+download PDF link annotation
    • https://najlepsze-w-polsce.pl/uploads/30991699578.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/71094264241.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/pinorafevojevadonufuluja.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a6aa18f2---65979498047.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/neparafobagiwemugejimo.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/mifafegagedepurinukose.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1ba828af0914b13d4719153b9210ff96/34092137540.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/zesunufulejifabi.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-01/images/files/71263164321.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/vubifakak.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/pazusubuxomuxozolam.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/46972014667.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/solasenepekitopemisow.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/sozugitala.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ecb49da1---puregevalo.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/kovafibapiwe.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/pewoxasujajivonuz.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/33892795631.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/gokelimepizinugunuluzuw.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d158498---57213852622.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/50854306610.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/vatev.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613882a5040f7---vogewakukajoveki.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/kexijinuju.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/69866c2532bedb7886e88ac11a1f28b3/5603659748.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_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 17620 bytes
SHA-256: 28777c22dfea1df1a4fb80200a4205efcbb3f519d9532ea3846e33f62f46ce16
font_01_sfnt_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 11064 bytes
SHA-256: c6f3cede61bd0d7236c28139e916391afd4acd18f491e0f4713636697f035bc1
font_02_sfnt_off00013287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1