Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9be430422a31de5…

MALICIOUS

PDF

86.9 KB Created: 2021-07-20 20:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab7ed8a36ebc4c5f631311085c158427 SHA-1: 4869bbd37b946721157b63f8fc17cf13ff899f97 SHA-256: a9be430422a31de5965ffbbb69994fea3838e0f4daac5388d58ff6213f4ce38a
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, specifically leveraging WordPress form plugins for file hosting. These links are designed to lure users into downloading further malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b3ccb8f2c---lofajafu.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a60e8494b8d---boxuniwibidukuzugunilum.pdf
    • http://muzeumostrowiec.pl/obrazy/file/22742292326.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa63008286---nitomawazidugawivekesu.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6228f01266619568adba13e69413ff4e/35913802985.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/74143232657.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/s7dqaq2k0imbh8951gjpoopmm5/sozej.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160803bb00e1bd---juxijuziwixamaduzamekuwad.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082384c3c122---29806553513.pdf
    • https://yellowstonewildlife.com/43115789013.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/4ivvs0fb4m0mdfp8cdu8ev6nh3/82032898328.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d2d88853---memavuviwubudi.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/91bd7472ce32b515033b02e3050dc0f8/34644416743.pdf
    • http://upoart.com/ckfinder/userfiles/files/letaduvuterofife.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7k1v8usdhp38hb536acot2hfeh/91252234340.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/39bb69b9b5b7528dcc38b65c71015bc3/nexekowebupowiv.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/32519007260.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/64260811976.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/372eacbd660496e6676716beaa41a345/kegif.pdf
    • http://eros-arena.de/eros/userfiles/file/monivowusevexiropopo.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea70487a2---guxunadefewajowinexixo.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c62db35b50f---41009616389.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757f5bdb1af---61476811550.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8ad9e004---77118368775.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/58728f43205a2265c6209c194509bef9/xokisejolenafem.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831e0cf879---risizofenow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hollow+knight+best+charm+combo
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/19823606884.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_off0000effd.bin
0e5d9b4ef7206487a8c9d4cff61b926313873bde37e39dc07b59c625de7c929a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 10984 bytes
font_01_sfnt_off00010958.bin
d88d8a67394c1a0f7373ead805b151159502f066c78a6f0175c25a8542e7f743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 17132 bytes
font_02_sfnt_off00013605.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13605 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.