Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb73bb5a6008e66…

MALICIOUS

PDF

93.4 KB Created: 2021-09-17 21:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 498b964f106a3cadf03892a6f0bb9159 SHA-1: a6b8ded30ad5bc55c47fd2ed79385b346c2b9be9 SHA-256: cfb73bb5a6008e66064b2b9ceea8420163cbaff08b638a7ee6716e50b6aa2f56
204 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or hosted on disposable domains, suggesting a link farm or redirection mechanism. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security software, a common tactic in phishing and malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://medvor.ru/uplcv?utm_term=windows+8.1+single+language+build+9600+product+key PDF link annotation
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/tibamuten.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/52244477032.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kuzutibukikobeg.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/43372794383.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/8896322357.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/90464858640.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/51610111359.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/bovedigizagotenup.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/638dc4f6d02edad0dee403ffa3743f69/14226656283.pdfIn PDF document text
    • http://exim5.hu/_user/file/93439440027.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/19094988787.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1c1645b7ff6b8cb37d89cc8408e9007d/reragedopukunud.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/56203058742.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/wivaguweg.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/wamezekilajebame.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/luvidorafabogakazexun.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/28953490744.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136a06a1e9d4---1140625538.pdfIn PDF document text
    • https://businesslife.com/content/file/bukobipiwimikuxavex.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/femuseva.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/vavebidofavapokenagowen.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614458a2cea84---zawiminoxaxawadow.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/53019872357.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/27650029089.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/kudiwekikeligupupovaw.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_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 18756 bytes
SHA-256: 80090a961eda6169946872d532061abb9e04b6590fe00ce307a5bf7adc76901e
font_02_sfnt_off00014af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF0 11996 bytes
SHA-256: ab2bdebbea0fba602ce4e0d092f9346fb3bc5b8b32c9c9bb9659bf482d514087

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