Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9ce190a917e9e8…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 21:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eead5b7aaf65d4bd474a30a072c3fd2d SHA-1: 1754c5eee7bdba55695a4ac954927447023798a9 SHA-256: 9b9ce190a917e9e839ed780c8a6e3e09052a8f6189c1fd91ffb03261125cd394
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 are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://allytemp.ru/uplcv?utm_term=android+migrate+to+iphone PDF link annotation
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/jagesopofonalonazutivip.pdfIn PDF document text
    • https://cedd.saglik-network.org/uploads/file/68581685827.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dda4c3e828de55e6f010bf165bd3a8bb/pobajoxi.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/gebemidilakotepova.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/33002011596.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/balebilinekenit.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/dudat.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/31992508372.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisirev.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/sebav.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/jotesovozuwukigobipev.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/jisek.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/58644152985.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/midosukowoxofojonamurij.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141381c9d8c9---28935187343.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/73945288167.pdfIn PDF document text
    • https://linardi.ru/files/file/10954323338.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/kudiwifop.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/98889445677.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/36773421009.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/30629349456.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/41663453062.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/64557219151.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/61028464770.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/14353693565.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/58150742915.pdfIn PDF document text
    • http://e-sheremet.com/img/manodulawigeziwiwutazo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a7ba4302---nigoxivaxinoguge.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_off0000b782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB782 15156 bytes
SHA-256: 6c2fb8cd69ae6ceb96762edea6daac792135d1b719a7b16314b94844bc295a10
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 10604 bytes
SHA-256: 2e6ecad859556c56157823a0138a8dbf34178d7382ae61241bd29e17e0b13c5e
font_02_sfnt_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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