Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff93243d806e364c…

MALICIOUS

PDF

94.8 KB Created: 2021-09-05 20:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d057380d67c49ccb0df108a86c054bc SHA-1: 6f1ea3b82c5e07a9ad53097d913df2b585bdeae3 SHA-256: ff93243d806e364c149a18dab03fdd5707397869bf02470a0ace6ca745c47960
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update to view content. This is a common social-engineering tactic to facilitate credential theft or malware installation. The presence of numerous links to potentially compromised or disposable hosting sites, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. No scripts were extracted, but the overall structure and heuristic firings point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://anhuifan.com/upload_fck/file/2021-5-9/20210509120421772064.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/mh6b0hicm48p3nb95nhq0udnen/losuxisitarunawajutavefu.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/17313969755.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/30/file/20210730_001520_186.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/sitabelomaleban.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/42296436898.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/geladepoxubo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc927962f8---50054139677.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210517134451.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/97756886491.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/zepikufoseranafibamo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607503426349a---55989972183.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/naral.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/wipobamugesawixotageko.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080c97151ce7---xuzezonujuvipikonasow.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/31935753094.pdfIn PDF document text
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/92087532864.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16091a146a045c---64161950794.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/34301432404.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/maxetodamatiz.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/3576973335.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095097eeab29---80341279358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fusion+360+sheet+metal+tutorial+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 19200 bytes
SHA-256: 49fad7bc15e6b6c0bad88219ef5b7b35a2164ae4d6249ea212e5c8e47fd87865
font_02_sfnt_off000152e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E6 11300 bytes
SHA-256: 627731abaa47f5b854c2f046dd134051ad69f6963bece1b22c931f9cd64469d2

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