Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdffa939246c732…

MALICIOUS

PDF

92.4 KB Created: 2021-06-29 20:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1d94945dc49deea1ef48d42fd7b8f860 SHA-1: af47e264bbe3278a992014ccb628226060db2fc1 SHA-256: 7cdffa939246c732e711b3a6b52c0e153d9856457cec2e45e4e10d466007a5b6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's primary purpose is to trick the user into installing a fake browser extension or update, a common social engineering tactic. While no scripts were explicitly extracted, the nature of the links and the lure suggest a phishing or malware delivery attempt, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://catamma.ru/uplcv?utm_term=troy+full+movie+with+english+subtitles+free+download PDF link annotation
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/fahakuiksubk698b0s198rmau2/89391121810.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cf33d69f8---vojugomozegakajav.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/9914711411.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/weletikuliletigepozifefe.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/56022093096.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/janijetaruxibe.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071042a338f6---68264181759.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/widikumipokipeweva.pdfIn PDF document text
    • https://windsbs.biz/files/file/kewetidogoxuwukedaw.pdfIn PDF document text
    • http://budka39.ru/files/niniwodarerewiki.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9223b724dd3764e8328818d6ba3557bb/zobojagusuzijivonaxixala.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/55f6eeaf429e747f1278cb1516d6de6d/44231560952.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/01sjfrarhmt2h7igqcclfip0sb/tukomono.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/55495620528.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/28491094500.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/genutamogej.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/26032345944.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/3f9a8b74f2dc094bc84c083bd7780f45/jizejaza.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a76a486a64f---gemisonojofolisivanoz.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/buviwipe.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/tixovo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/47cc149b495f104a5ba1753597a298b2/borinupafisut.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8cdb1e67c---64058433242.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94771d345---busiziwiti.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210629_204620.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_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 17812 bytes
SHA-256: 71eac10ec44bbf58dae0ded248ec89d3cb36b8ed5284e752bf96500fb8f52c34
font_01_sfnt_off0001316f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14986 11272 bytes
SHA-256: 475052c7a620cd961a81e2e85db7de41732f2a1aac8f9dec25452ae055f65893

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