Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d50a24551fe275…

MALICIOUS

PDF

115.1 KB Created: 2021-06-27 21:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b5d00df4bb83e019284cb9369ff6b0e SHA-1: 85516cded4542210f5154a2a09ab5536e5f97f8b SHA-256: 36d50a24551fe2759377173b5b67dfd9d6eaafeba12178c735cb0e35851ef4fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://archism.ru/uplcv?utm_term=the+key+to+freedom+wow
    • https://etonbio.com/newsLetters/images/file/xafiropogifunoxusevokasa.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/00r0blhl7f0od5scfghlptq0qj/ritiwetazuni.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16098672b14a3e---91392931045.pdf
    • https://deltagroup.bg/uploads/file/bojuzodeluwidujexoj.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/mabimazefowumujilu.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7592399376---61590819668.pdf
    • http://russkiivopros.com/images/FCKeditor/file/mavomubap.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831e70b1bd6---nugivuvugamabupinivemonav.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/flf5ajgkqgk1an5hmenrs97ng2/47593650659.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57f6964e5---goramovokenajaxitupi.pdf
    • http://gandolfiarchitetti.com/userfiles/files/pogevokiriwebejumujekezuf.pdf
    • http://hasyo.net/files/file/mifoxonadagixidanematod.pdf
    • https://bandai-k.com/userfiles/file/xulavevetelusunutukaw.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608015bf5f70b---sudijoke.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/scp12c9hv8eb3d9c23nu1dur0p/46690710240.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bf9a6720ac713af0fc0e11f79e81073c/tilen.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b0b50418d7e188100958c14f5d8afacd/99483718955.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f63cbd60c4aa692ec387cded82b88d91/penulujavoges.pdf
    • http://greatnice.club/updatefiles/file/27010548698.pdf
    • https://sieuviet.net/webroot/img/files/pesowaxatasamudabatul.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/54a482aa64d0c107d89fc1c6c2d16755/menug.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a159cf37895---32944282493.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5deda9bf15c684d798401e142b6d7545/relusopaxusugulog.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9186c7c3bdbb90c620e9d53dfe485175/52180306430.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_off00016061.bin
8cb3263e84b7aed02f7e13988cbdd6ea7a761acb90ff705c2acc1a248fe07e2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x16061 18484 bytes
font_01_sfnt_off00018fb6.bin
8a31eeb5a556d0ae477c3fce3afc3a57f1dab097669015097eb14c60ab8a7325
pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB6 10304 bytes
font_02_sfnt_off0001a70a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A70A 16792 bytes