Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcfd9373dbb1d2a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 14:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2768a3781e1c7fbe9782f7b781ee7c1d SHA-1: bcd5bc75228598e4e4ca10cad4dab23e736f8c64 SHA-256: 9bcfd9373dbb1d2aa207db338f65e4dde5fd91ab4fe017fe66587e1949d706c1
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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=how+to+install+minecraft+hacked+client PDF link annotation
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b6eb4c6821181518ce132ebe8c4a9372/wuleseremusarinugataxurob.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/6966097022.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/22245892460.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/zimurusimesupikuwokeb.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/31057003954.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/niwegimezanoxawisarodo.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/40955447471.pdfIn PDF document text
    • http://ktcz.eu/files/files/54852586299.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/xasateritiwikikurad.pdfIn PDF document text
    • http://schokofontaenen.de/idata/43164452483.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/dalozivem.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/26901711869.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/pelidogabuzulipuk.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/wulitunujujuzamudowow.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/74883185082.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/32936123253.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/84320265713.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/37983193534.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/lalolexumexopidusu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/32961f66b66760352b4de43aa0931527/9925736001.pdfIn PDF document text
    • http://abpaluso.com/upload/file/tosoliwatekokajekepomid.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112096b310---xotikuxunesogigevu.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/zurotatumepugovufofalo.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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 10908 bytes
SHA-256: 18d3e46ea9f76a8acb4539416a175dc105cf2fd3f03bd313887080be472cb0b3
font_01_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 17408 bytes
SHA-256: 6b4f7d3cb95e3ab371d136d9c89b674f975b06f4b10f07414553a688cdc0d02d
font_02_sfnt_off0001200d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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