Malicious PDF — malware analysis report

Static analysis result for SHA-256 743e9114f75501f9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 23:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3093ca905e022db7fa5ebd95bc6f5a73 SHA-1: 7b79fa5d8df38e2da3cb2620b2c2d533f0738076 SHA-256: 743e9114f75501f98b4314dfd019adc257214a1d0f4653cf2ac42241f1302a96
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress sites and link farms. Heuristics indicate it impersonates cloud document services and lures users to install browser extensions or updates. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://crysiq.ru/uplcv?utm_term=which+app+is+used+to+open+apk+file PDF link annotation
    • https://tectrongim.com/uploads/file/mexunuvezivinetodawutuzom.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/fewapowemasevakapor.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/6174390084.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109202105289415.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/pagokoguxafelufu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/80129399528.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/59084027060.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/91020891054.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/bekezutetive.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/58369617233.pdfIn PDF document text
    • http://skisun.it/userfiles/files/ginagemizulogu.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109031359416518.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc172eed5c---nonenibikipifosepu.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/49871009739.pdfIn PDF document text
    • https://mbbs.hr/files/gimirim.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161375175e1c86---5534329979.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/wumunanebiruful.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/gevinapomisewo.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/23187891625.pdfIn PDF document text
    • http://cripper.de/media/61540783617.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/21e86891348972b4c28c6e301d66f346/rufojepuxomalobim.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/67580484535.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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 17044 bytes
SHA-256: a5c7ce6d8380e9eac721583baa55ad1eb6a058c0a3db92220b26d776cdec719a
font_02_sfnt_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 10804 bytes
SHA-256: 29d605f0ca99f352949050d474af8235bcc105fdf5feebf8120dbd1d842144a3

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