Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5d16b184eb5d8f…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 04:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40a385a5828c03846ac4256b7c7c2138 SHA-1: 4f86c43e2e4c961b33a4504b62130b3961463b64 SHA-256: fd5d16b184eb5d8fbd824827e5322b5f2fff05667a79a7f0a95244cefdd790fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users to malicious sites. The presence of numerous links to compromised WordPress upload directories and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://soleilboo.com/images/uploads/files/palodof.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/gijivefejoliveladusapujuk.pdf
    • http://genarchi.com/data/temp/file/97924382514.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/07340ee747c1246e0d4e1924e3d90a07/kimuzexigex.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/gofafadunaf.pdf
    • https://newcar-rental.com/uploads/files/202109040548255139.pdf
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/98054134330.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/fubeketaveletefilojenik.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b47ec1dfca56af7915c13dc8d5539753/24500752935.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109061131037047.pdf
    • http://kooijobs.in/ckfinder/userfiles/files/19177260715.pdf
    • http://tribo.kz/userfiles/File/kuxasojexozetezejolixe.pdf
    • http://fundacjahfg.pl/upload/file/taxokuwigazazukaxejiku.pdf
    • http://salamino.pl/userfiles/file/92076496781.pdf
    • https://cr2tek.com/userfiles/Proj_Name/files/50194487035.pdf
    • https://lose-weight.tw/upload/files/wudesekazobuzofibevu.pdf
    • http://girlstown.org/files/js/ckfinder/userfiles/files/66648376817.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1221c1201dd9ea1e4ae737fd311d5865/32309048344.pdf
    • http://bbhshipyard.com/userfiles/file/pesamajidu.pdf
    • http://brukbet.com/user_images/file/zazirajimoluzopi.pdf
    • http://vibrobreaker.com/files/files/pipaminumonikewiva.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2b1af6a4df0095484009779f5d2eff86/mazamupirurizolideripus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+photos+smaller+on+android
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/70297258117.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_off0000ed8e.bin
599b35db539bdc454240492eb59b0a56b2f730b5fa49b927c2905f3af9efd916
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 10828 bytes
font_01_sfnt_off00010655.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 16792 bytes
font_02_sfnt_off00011e67.bin
4fe26e892f2ed491dc8edb22b73a95a73a41a12c1051f7b20ae5002072d8ac10
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 18200 bytes