Malicious PDF — malware analysis report

Static analysis result for SHA-256 a801c4aed61e5a94…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 15:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8272d22d54ca7f4f043311b05a98a399 SHA-1: af7c84d1caf77c8a0d3753328fbb3d8377d14647 SHA-256: a801c4aed61e5a94be26c8e116804a58d242f0aa42e82beb9701c09ab669a019
144 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a social engineering attack, specifically a 'ClickFix' variant, by instructing the user to press Win+R or paste a command into a terminal. This technique is often used to bypass macro restrictions and directly execute malicious code. The document also contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a distribution or redirection mechanism for further malicious activity. No scripts were extracted, but the overall pattern points to a downloader or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 7

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://oniceh.ru/uplcv?utm_term=how+to+send+a+meeting+request+on+outlook PDF link annotation
    • http://geyikkimya.com/userfiles/upload/file/maxesevujegepitono.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/43664838072.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/79f91088899f0a5665c242e622990ec6/dewefapalowugawo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71d6215f0---zuxinejosejamabutukesub.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/97770598260ac75c0bb018.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070a5820525c---nevikajegat.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e096823c67---35111865611.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/obmjboejtu0olqttpv4vocom8c/solomigikena.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a5d991981---69028293981.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021618050178601.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089e07e35a4a---dalolenisagoxogo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/mv2n7ld0hpam7lmo0smc6jdoo3/35952085447.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d7f8952b188546ac2ff43de1faf48aed/dilefijivo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/raraso.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/89043933180.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/95374796063.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43502084042.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/dugomikifusitomorup.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d92a95e560---relibukadef.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc4cad433f---27166097476.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78b81acf3---nusevegux.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mds2j4kqifk8iuof7rohlofvu6/232375634.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qnhv0njls78bnn3f7vj48nsq8j/7011429168.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/pli72tjsd478m76llo21msj5q3/nevowaminewat.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/retimejora.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_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 17608 bytes
SHA-256: ade3aa8ff9b5d25e740165e009130e5fbf227517ee52739b7dad3ab90dc63cc1
font_01_sfnt_off00011902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13119 11004 bytes
SHA-256: e97b6240cf60612e6973ad1e79c44714701349a829f96b2a2d46c94a48cfe0e2

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