Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc22ff8d7c4b0cc…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 02:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 140e0045fe7c7b5b46143f18f118cfdb SHA-1: 78669ea3306cf84bcc4b70259d0f23daac1838de SHA-256: 1cc22ff8d7c4b0ccaa4963c0ff9f15742bd19c331be562e1ca468bd69b31c1db
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing lure, specifically using a 'Browser Install Lure' heuristic to trick users into installing extensions or updates. It also contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a dropper or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=video+downloadhelper+chrome+android
    • https://defi128.com/userfiles/files/samaraf.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/2793346523.pdf
    • https://khoahoc.timviec365.com/picturesfiles/1060821012.pdf
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/tevoxenu.pdf
    • http://drivingschool-brno.eu/files/86436235662.pdf
    • http://coyada.com/up_images/up_images/munamovulufepositidozef.pdf
    • https://springkasteelhuren.be/userfiles/file/fumenamiviwipasewomul.pdf
    • https://glaze-metalart.com/upload/files/29495717197.pdf
    • https://zagorjeadventureteam.hr/files/92122899783.pdf
    • http://www.huescalamagiaenfotos.com/userfiles/files/bajemopedofavu.pdf
    • https://kurtoglumob.com/upload/file/vubawumitoresufuf.pdf
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/nuneruwezagowifiwizavefo.pdf
    • http://ayhancevik.com/images_upload/files/24977904988.pdf
    • http://parikshitconstruction.com/uploads/96160692284.pdf
    • https://buzyhub.com/files/mekatoduzorotidi.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161364ec7f3983---mapiwobijuligizita.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8cf6ebe61---13399223519.pdf
    • https://fasleh.net/Files/files/jovedifako.pdf
    • https://karlschool.org/uploads/files/202109080022097115.pdf
    • https://akilanews.com/ckfinder/userfiles/files/48361163127.pdf
    • http://otestmanager.org/club/data/userfiles/file/20210902195224.pdf
    • http://madurastones.com/userfiles/file/dibopawavozegexugi.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614048881606f---tekuxufivosogatuletixir.pdf
    • http://muntepa.com/userfiles/files/29835252432.pdf
    • http://kelkenaghshband.com/app/webroot/img/files/nasonavoliwafixowif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e827.bin
f1110873cd5271a66d321c6ad4a24974cfe3383e1d883e62093ed2092d706fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 10568 bytes
font_01_sfnt_off00010006.bin
6a8b9512e77f4efbac1f933c0b92ab11a65904d2caa503b70b1db548ecc20230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 17364 bytes
font_02_sfnt_off00012cf1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF1 16792 bytes

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