Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f32283288866564…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 15:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b4fb42cfd8a66f03d4a7a0abd3e86d7 SHA-1: 2d4e5208d90c4ff1bf6e008eddc53b70a86c8eb4 SHA-256: 8f32283288866564386786731fa8b3ea39e5a7ef84578c5894951805090bbec6
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 part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=website+to+download+indian+movies PDF link annotation
    • http://timeyear-v.com/userfiles/file/81229489810.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/4723776893.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/65494502290.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406eab97904---wazududojasatomulovaniz.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/zupabixavojaxusowag.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7871dc1d3---20863920266.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/18616413533.pdfIn PDF document text
    • http://wamer.org/userfiles/file/kovizomowisesodisokukar.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/zawibofat.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/fumaxafesorufumupu.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/86851037715.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/tixetux.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d462a08e---65021262972.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/zemupidejigudo.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/surekidebumonexamuxa.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/wujowenorupuripejilizalel.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/fepakavafonate.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/36136854037.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210914122153.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/57351205028.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/28368348800.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/loxogut.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/dolexuxogerimefaxo.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/xolunajowisepuketololose.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2b511c42de45e7c8e502ea0192dc9277/72821576838.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/baborixuwuwuzedowedoz.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_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 10596 bytes
SHA-256: 4b48bc4615875b556a7f93853c6c86eae4ade7fcf40fd4981695cb239d71bf42
font_02_sfnt_off00010e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 17792 bytes
SHA-256: 62ef1a6e49fb87d9668d2fc5b4a6991822caad6e862cde193556da2471a6a6fa

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