Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e46596ce8a4984…

MALICIOUS

PDF

83.0 KB Created: 2021-07-01 18:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 856ffabcb55c252ec388f6ced43f9f9a SHA-1: db1e679c3970fd50e3540ec72746d8289434048a SHA-256: 61e46596ce8a4984f9ae5bc27ea1ac587f409125272ae8359309606aaa6033ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO poisoning to lure users to malicious content. The embedded URLs and the nature of the heuristic firings suggest this file is part of a campaign to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=vienna+convention+on+road+signs+and+signals+pdf
    • http://atut-biuro.com/uploaded/file/18546297219.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/7d4f394af12e2d558420bf057532f2e4/suduxi.pdf
    • http://servis-hradec.cz/files/file/bidogugitufa.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd150d0de8b---78731942230.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b632fb715f9---zopitanomuwub.pdf
    • http://dblbtech.com/userfiles/file/ramolifijo.pdf
    • http://3dtechgroup.com/uploads/image/files/sivezikejezuvuba.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64eeb26ee---popomupijev.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/3566abf003054612950a9bf7b8deb44e/fixupakituwobego.pdf
    • https://alternativecarrepair.com/userfiles/file/92518997691.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d825a32e3f08128526164692e0aa5e74/bujararejitunij.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/165bec24df8b744db13646c79fbbef22/vozofad.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d0639830---10570507463.pdf
    • https://samarpanbharat.org/trila/userfiles/file/seroradakanopulitafumam.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/m42imtq27kbmitnbp7avo5sm7l/kugifemo.pdf
    • http://amsasecretariat.fr/userfiles/file/21076669863.pdf
    • https://tipresentoio.it/images/file/divugezim.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088082fc39a3---2871488654.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa303f78e95---lakibimegudovewojux.pdf
    • http://sostrevalli.it/userfiles/files/runepas.pdf
    • http://zge-led.com/luodan/images/userfiles/file/69241496004.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_off0000e181.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 16792 bytes
font_01_sfnt_off0000f998.bin
cd5e55a4402a5f70ef62538cf818ffbc344e672c295c1b1b76fabb72356b8ac4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 10832 bytes
font_02_sfnt_off00011289.bin
dddb9826c2344499868ab7d8ca69f8f893d3e5b3c8b2ce55210e3de726163666
pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 16868 bytes