Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8a65072ded331e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 03:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13616e286c26dff69e268b75387ac8f2 SHA-1: 877e0ee8512c2491259cb1eba90b8044386f4172 SHA-256: 3c8a65072ded331e53eb6918cb872716ac966fbf1545614b7eaddb4fd8dca9f1
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 are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=download+play+store+for+windows+10+64+bit PDF link annotation
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/fepidapegu.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/nomunugez.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a93caa39e---dalajoxegizudokasefevov.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/nuxoxogil.pdfIn PDF document text
    • http://land89.com/ckupload/files/72542906995.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/97244307791.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/xitineveperi.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/fowefakajofenaxiwovusire.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/zotor.pdfIn PDF document text
    • http://esistore.be/userfiles/file/lenesitavevusufigufog.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/sokiguruvuviregufi.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/85466251591.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/14435625238.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/58571503176.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/46344756093.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/11481217178.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136177e11b20---jesolapu.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/lavenedugiradorofagomoxo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b5e57f774471d5bc7f9f3a323000a6e2/jemufuxadedakukuj.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/37268775860.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/93182968490.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16147bb6e590d7---46233756769.pdfIn PDF document text
    • http://metallpress.info/files/timajugatawefalise.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_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 11252 bytes
SHA-256: 29a45093fd4742d246647475ff3afb50db9152e20f7eaab26e37809fb23b3895
font_02_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 17488 bytes
SHA-256: 3f4eacf0f9af81a6cd538d518bda2cc23e3ea88499af216a9a18da2b0bc98ad1

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