Malicious PDF — malware analysis report

Static analysis result for SHA-256 305ce831e3e422a4…

MALICIOUS

PDF

98.0 KB Created: 2021-06-27 07:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a603b1f865a8642f24add4d377cac365 SHA-1: 590f5b8cba8d66d9d7c74b53c4ecf16288d65f5a SHA-256: 305ce831e3e422a4901402f02b21fba41ed658360e6e0e9cf437af953d3beefc
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and numerous outbound links suggest the document is intended to lure users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9326

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 https://allytemp.ru/uplcv?utm_term=christmas+music+frank+sinatra+and+dean+martin
    • http://pastoret.it/userfiles/files/20682263951.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbb1ffghuhluspj4t0385nmt24/lukadowobixofopugen.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/l277utgj8hp6tupa1balvej9e5/lixowafan.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adc745dd784---taxodogumam.pdf
    • https://ottenburger.com/userfiles/file/42658827177.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/91267a6ea51df3db60a03cc45fb4b4da/kapujuzisolode.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c8450e1c0be7f19e5b8267b7f29a80c5/xalupojorujexovoxosu.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99524306351.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n51qpf52qh1rj96em0afh2vp2h/3570799922.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9863eff9a5fa87e158a08d2b81b2f736/wopuguxoxiwonaso.pdf
    • http://akinmedikal.com/uploads/file/80932677719.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608556d6b00a6---34633386047.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608494cc8df9a---gapitifal.pdf
    • https://eobliecky.sk/userfiles/file/guzodaxemeralar.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/46pqct7sjtklsgvceoa4qpp2re/65170061150.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae6311209---kivigilopuzilugudud.pdf
    • http://seoulsquare.com/userfiles/file/58730240174.pdf
    • https://agrimal.pl/userfiles/file/migenapowewegi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0488d44d29---97448609052.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/03fc40f59f6ca0f993b07fa81d325940/75066827470.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094c88718229---95306452191.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e404848c4---kuzisesurumefuxinan.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3h2bhm3ov9p5sju5cb29php3o1/texemijanusizufid.pdf
    • http://www.annaleehuber.com/content_files/file/xugufabotilodolapiw.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kn1rodhqo7uglrj5nb99cv9u72/ruluwilaloza.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/eimr6t0o1o2prk2pk63p8uhp1a/xawiradifudavidafag.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e2fa14d6---72604691663.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d80ef2ea---27191372338.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20c.bin
7d53c1833e2affc8bc6ae843d6b0d908a0ba09cd0647e704cc18ebdbc0433618		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 10796 bytes
font_01_sfnt_off00010aca.bin
b646e4e99f19ac05519abaf59ecb91311bfd919e7d59cfb2ca623a477a188405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 16232 bytes
font_02_sfnt_off00012048.bin
f520c0fcd788dc9f53794c85e9620ba4a6dc816cb4ce87d0cda1f82b7ba1d4e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 3624 bytes
font_03_sfnt_off00012e61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E61 16792 bytes
font_04_sfnt_off00014673.bin
2c5640aa3730da485f21712a63167e1deb3ea1fae8654db760654998d0a3bac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14673 21392 bytes

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