Malicious PDF — malware analysis report

Static analysis result for SHA-256 5189bcd588a2f662…

MALICIOUS

PDF

72.0 KB Created: 2021-08-20 23:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 055c4c3bc9bf9a7d622c35290f20a81c SHA-1: bd0d8cc3bb9b6ac18da4cf013acf76f57d2d14ac SHA-256: 5189bcd588a2f66286761e512420b53e1f4aefa4a972eee7837bc50209b8a980
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for link farms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://duszek-lasu.pl/userfiles/file/55027673746.pdf In PDF document text
    • http://bong-dem-long.org/upload/editor/files/95160846510.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/tmk2s6dnltvh0t9tp0ejl5m0ni/93057109181.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/zegugesujagu.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/2b77de2d2d3de25f819992bcd58333ce/86280796121.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/sogisitidu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba5210da3---76223334896.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/89222011270.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/bijovadesobo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a145bdc2---88954307604.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/vaxigowefamokasojat.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/if4s6mafot3j9tpsk3mgc2n8f1/fetelabegexovunonejibij.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210807063157.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/29204892660d3ae36cbecb.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/savape.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/904a8b89143bb9c0625ad6a27357d31c/fibosasijitexupog.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607386e262a99---84357471027.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b8431454---kojad.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/sunuzirojenilizomafezu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f04e1d73---popav.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/91605533324.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/sutukatuximamesodod.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/bukurazukiruvoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+the+program+movie+dilwale+in+tamil+dubbedPDF link annotation
    • http://medlab.webd.pl/upload/file/88679199766.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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