Malicious PDF — malware analysis report

Static analysis result for SHA-256 5736545eedd933bc…

MALICIOUS

PDF

80.9 KB Created: 2021-06-25 16:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9858507d75dd15c31333b011e0d89f9e SHA-1: d4050b7a40eccd23736fa7478befb9ceb7c60eb1 SHA-256: 5736545eedd933bc9d758d1417c6532d4705f39d76bde32e07d32cb3fc76bc76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The ML classifier output of 0.999218 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=rs+aggarwal+class+10+answers
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a88d72ea1fe---rizitejiminodelodidezebe.pdf
    • http://mcutech.net/files/67049245569.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094747c1911d---28756307586.pdf
    • http://robalton.es/Albums/images/file///solipobafizetisidagobevu.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dfd407b52a510d7faeff416ee5e2fb91/46122878722.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d79fadb38---61127265494.pdf
    • https://terminal.hr/userfiles/file/kutoruvifukasudezu.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/95ff65c7bb675e8c8d0ad629ad3a4a7a/ralufodomupu.pdf
    • http://yoron.net/up/files/12374222294.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qmvepjoq30lohhn2k78b9t3h76/nowajejewuboka.pdf
    • http://amuseonline.com/absite/userfiles/file/fidunagoravixavoxapara.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2811257b61---89185920480.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/103fpkh0dd57ld4jlgq5re04ce/vegetexufafasoxopat.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/m0i9rrt1djtqtq442k5suqcdi7/63404852859.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/3258853355.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/iq8d43b5ibsh4kf61fi39iiiiv/roxezuzojorobixopa.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c347093c74d---lezijowakefo.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_off0000dc18.bin
e3275490e9c7ed97650229264e20e55fc9ac474cef0048e7b30a3c62b5acdd06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 10400 bytes
font_01_sfnt_off0000f3e9.bin
d45ccf284a706d1025c5b0241b47e574334b6597e5d6cfff950e622644340e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 16536 bytes
font_02_sfnt_off00011ef3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 16792 bytes

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