Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a9cccb7c11f80a…

MALICIOUS

PDF

103.7 KB Created: 2021-07-24 02:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 80fe640275da2a1466d55da94e4a71bc SHA-1: 99bae66fb5cf57e511f17d46e855e4d20ab8cdbc SHA-256: f6a9cccb7c11f80a45d92917de42b3b908bc9e8f3720952bf43d10e49d754b84
196 Risk Score

Malware Insights

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

The PDF document contains a social engineering lure, instructing the user to install a browser extension or update, which is a common method for credential theft or malware installation. The presence of multiple links to potentially compromised CMS upload directories and disposable hosting suggests a phishing or malware distribution campaign. Although no scripts were directly extracted, the nature of the lure and the detection by ClamAV as a phishing trojan indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://sbnjl.com/userfiles/files/59542761947.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/96f35bf7632751de4865fa3fb9aed891/wanarud.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ba25b8be55b---zujojosibeneduredafupa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a71060e007b---fatewolekibijunake.pdfIn PDF document text
    • http://kotolantopeni.cz/file/90636033169.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e36ee14bf4cd91fbf748d50cd7a041a4/xizone.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/8517873540.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/dinuk.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca94f2306---sumawapaduniver.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/foruvixar.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/t6iltb6uemuhuqqii002vpecn8/25386840941.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad920073ba2---kalalokipawukogazix.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6cac5481b77ffb548040bd878a4c1f20/12435077261.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4b6bdf8ee26c73ac07816ba681c6b38d/betifugutababigujes.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/78891836060.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef2085c06e---nubewizevaxaduvawifuvob.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b26b9c7145---88952605049.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1bb30a20d---41412093829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+free+vpn+on+chrome+web+storePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off00013022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13022 10788 bytes
SHA-256: 4befb84b164f0d93972d70cec36caac2f540b311704025dace63422aa0167340
font_02_sfnt_off000148ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000160c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C0 18072 bytes
SHA-256: cd19b0d72e2dfefcad0793cd6599b81de992e4a28f9a06bed16a1f44757ed9f1

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