Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f31d7ffe4e54e84…

MALICIOUS

PDF

98.4 KB Created: 2021-07-15 13:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0272ed354970a02910198bd391b964f5 SHA-1: bc59229cf4c3ece1b32fca139cbed782fcdd170c SHA-256: 9f31d7ffe4e54e842e2439bab6699e78a41e18906ed19a63c798d5b91a1f666d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely serves to redirect the user to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://topclassgreenery.nl/images/file/tomaganimabefeloradiku.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/xafulup.pdf
    • https://dovolena-jiznicechy.cz/uploads/lizolifixet.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b09b22592---76541953968.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac84700e93---nezafozawunep.pdf
    • http://computerdoki.hu/user/file/kurod.pdf
    • http://beiwendq.com//data/attachment/file/94433611139.pdf
    • http://kappp.ru/js/ckfinder/userfiles/files/vivenalenediji.pdf
    • http://faceconnects.com/ci/userfiles/files/34835900554.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df45b50fa---5287245020.pdf
    • http://esoftland.com/userfiles/file/30570767621.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acb5f4d22d---situxuw.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a6f5943043a029ce6cc429b9a7c60271/satifog.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f941c5c37---38925620140.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa375ac21---52654483745.pdf
    • http://zjxfjc.com/uploadfiles/files/81228457877.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/443fbcc6ef5ac403e6aab87b1faaf826/86818954916.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/55488153329.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210705_CBD2AA93B3EC29BC.pdf
    • http://robertoantoniz.com/resources/original/file/wijuzalibizuviximajonid.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fef4c426ee8b9f273553b4f8dcd2615c/dupiragaxiboturop.pdf
    • https://vadihosting.com/calisma2/files/uploads/60620029357.pdf
    • http://villaelen.it/userfiles/files/10673897631.pdf
    • http://lg-palette.com/upload/files/zapuputiton.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=security+analysis+first+edition+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011744.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 16792 bytes
font_01_sfnt_off00012f56.bin
5aaae9ca9a1efea665266a57ec792400fee247ba18b5e6f7b5fd56142d98b309
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 21964 bytes
font_02_sfnt_off0001630d.bin
61a25f69bd2acf8c93d1153c5059f65b80e599575ffeb68183baf08bb34ecaee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1630D 10904 bytes