Malicious PDF — malware analysis report

Static analysis result for SHA-256 422b9b47a8c95ef4…

MALICIOUS

PDF

114.5 KB Created: 2021-07-26 11:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8fe4b28f9aa500c7e5e1355ca57456a4 SHA-1: b4d3368728c40eee2624ae8d0c9eada818e8b394 SHA-256: 422b9b47a8c95ef474db01e654c5925934fe756acb1102e0efd7bfd35d2311d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis point to a multi-stage attack leveraging external resources.

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 http://akcjonariusz.com/UserFiles/file/zesutagusujexikatiwi.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce83816243---luwazebupa.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/funabipomifapusewurokipo.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/34365660287.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/11646892850.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc836c31a6---33835206596.pdfIn PDF document text
    • http://allasclub.com/campannas/file/nixorotupewimebegozagak.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea83e80f9c---47774906446.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095d47395228---kubizopadibazofupagirerop.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/59300435589.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/depumedox.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/edd35e8b673158e375649452b6744d4a/zasovil.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xapel.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28db94e36---78973530728.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822b4ff15c5---61103163145.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/21f1ad5bca9ffcae72f8622fd54f62de/50664162640.pdfIn PDF document text
    • https://wita.lt/images/files/beguwagulepeji.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aebfe7205---59026403040.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/95b2e036388ed51412104e03a9934fed/41570967536.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/8172547466094213014203.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9ab64238d2e920de2a9a9049597648e2/tebagogosino.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7ea7a76b6ec4d56889c7bca3de6d2505/tusovapanaxuguzikekuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=enterprise+risk+management+report+samplePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BC 10672 bytes
SHA-256: d921d83aebcf0afc0334d306488175ae2f26c1b14421a5c65a24662f7cf004cf
font_01_sfnt_off0001722d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A3F 18228 bytes
SHA-256: 5f366b4b5445fa442eea78811379e75034d0756116de89a7f92ed6b07e597034

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