Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b388dd2ab5758e…

MALICIOUS

PDF

87.6 KB Created: 2021-09-21 13:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b99aec4879ed9c1065342e9d3b17e508 SHA-1: 17e52927797600de9670291d08a6ac2f7e492eaa SHA-256: 36b388dd2ab5758e2f3812536f89b26e7f0b453d8f991543d7bdeb03c0ee2649
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript, which is often used to exploit vulnerabilities or deliver malicious content. The heuristic 'SE_SECURITY_BYPASS' indicates the document explicitly instructs the user to disable security software, a common tactic in phishing and social engineering attacks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://cissud.eu/uploads/ck_editor/files/degolitumenojokilodejux.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161431a3232230---24394778353.pdf
    • http://heathrowairporttaxi.website/userfiles/file/jorabumaxijolidarigas.pdf
    • http://mnarch.it/userfiles/files/28054638353.pdf
    • http://nanumed.ro/uploads/files/vozojefawovema.pdf
    • https://shidoremicrosys.com/media/momuxijifesilago.pdf
    • https://djecijagarderoba.me/userfiles/file/42907426250.pdf
    • https://geneticapanama.com/userfiles/file/ninule.pdf
    • http://jcnjl.com/userfiles/files/vifufunokebuxe.pdf
    • http://kaizousha.com/js/upload/files/luzejuredafomi.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3nuch246k366dpucijvr11q0ao/91239281016.pdf
    • https://global-product.org/CKEdit/upload/files/9987947600.pdf
    • http://umrllc.com/userfiles/files/popoxeku.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c13e1031d7---37457727629.pdf
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/soteledisuzuvikisexosas.pdf
    • http://fanghsin.com/uploads/files/202109121634233497.pdf
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/pefitibifogefolotikixage.pdf
    • http://onsijsselstein.nl/userfiles/files/kevativajugejimuzawato.pdf
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/62332320476.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/hhe8k38ulvp4pj8ughj5geh3ik/14183306695.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2fe329ebc609281cc4fbba35d0021f2c/11054198978.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mumu+app+player+free+fire
    • 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_off0000e6c6.bin
526a99f24d6e4f55e972ac162f6fe8f6dec8acb1bb33a3098cb4011cc982a469
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 22896 bytes
font_01_sfnt_off0001222a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 16792 bytes
font_02_sfnt_off00013a41.bin
7cdd6a21dbb7eb31f36f68ed50d7c8809420d0a3f6188bf9b55678f7af2ba810
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A41 10236 bytes