Malicious PDF — malware analysis report

Static analysis result for SHA-256 113836feb78240d8…

MALICIOUS

PDF

86.6 KB Created: 2021-06-27 11:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98162eadb4eabc4ee8501b60bc970116 SHA-1: b0c0be3bdd7abe1af257eaa5d6a21a91574207d3 SHA-256: 113836feb78240d86cbd82ae581d3ac258cb20291b75aa3d99afa4a8445b4a75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/p7ch4m9u7sl3bdicpk567i0j0t/bedodadirememomokojutug.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5707ad3ca---63010388836.pdf
    • http://abwferrellpkwy.com/uploads/files/43854101167.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160836fcadc4c9---33741823550.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/5a27d98adee24a381e142e11c6bf32d6/runasuputumisejanu.pdf
    • http://fitviewer.de/files/file/89449271208.pdf
    • http://zae.me/datafiles/file/65961828120.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ektv4sk6p260eprh53qfggva3b/24352858571.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160721e467d234---62067105741.pdf
    • https://tavio.ru/files/file/manutiralu.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0bb0cbed1---13974604680.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/cb0ef06porhfbojjvf26chpbdu/74505530784.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3ec2419c8ec358f31f7d3b3b889892cc/33339726686.pdf
    • http://vinacafe-dalat.com/Images_upload/files/lavisuxuj.pdf
    • http://funperm.ru/content/file/74873044574.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/17900819702.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d75595e93---11740084057.pdf
    • http://drivescuolaguida.it/userfiles/files/dekupepenumegoxifol.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160969231b42d4---gozewinafe.pdf
    • https://ebooksweb.net/files/file/41195966585.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721f119bcb8---8988266601.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j7mll9omoi3eirnkr7vgmkam0h/sugubirekukipisid.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/83614891328.pdf
    • https://flyags.com/editorResources/file///70810488743.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=deaf+and+blind+school+st+augustine
    • 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_off0000eace.bin
6ae4a129a406e15ae5b31d7a4815a120b924e27938efcdbad1ed518660d38095
pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 10896 bytes
font_01_sfnt_off000103bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 16792 bytes
font_02_sfnt_off00011bd1.bin
762aee7fb8f7b1421517f7424eb746657bc1de4e52353fe05eda39a70c4811fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD1 18368 bytes