Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3ba1f39145a3dc…

MALICIOUS

PDF

78.4 KB Created: 2021-09-04 01:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 680c8ddd3161214ab44cc7370a346c75 SHA-1: cc1f4fe95821222653f0ed51fb7a16991a8d9884 SHA-256: 4f3ba1f39145a3dc889dac14bd4a168fc6e79b9e18cbd3a4f0587d177619e28d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://globaltranslation.com/demo/global_translation/beta/userfiles/files/54121544019.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/346b86b1fc4bbc37c5a9835751bb5442/gulop.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xijugaw.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/jevidesesexiwapobupade.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/85654663712.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5eef1a130---melegugovevak.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/54064743064.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/907efc5dc161ab853be9fc6b53118aa6/81813756815.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/pelun.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/38441921781.pdfIn PDF document text
    • http://esistore.be/userfiles/file/setawugusokesufuv.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/zabozewejijujef.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/82b64103d7e86a8ecbcbe0f93cc3ee38/vibugexifamedoxurobo.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a88dd42d2---puzufitidugobabitewujen.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/jusuzozi.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/06be20a9043201ef457cc17e4f069d63/82389529694.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8426fab2c3---nadomirejase.pdfIn PDF document text
    • http://compsult.net/userfiles/file/zuxijikoxabebuwilovawegim.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/fofut.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/98765081401.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/fb2e245920b02226dc12b8a1fe5035d4/86398533491.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2m03nir8d2mq64hmnscmp024k3/felajigavefuwuro.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22724036256.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/94724216143.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b91cf32a452b7c73ed969752644a82ed/27076446918.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/46974175945.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160826fdae6640---75233394144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=spelling+practice+worksheets+6th+gradePDF 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_off0000cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 11216 bytes
SHA-256: 293e848b056bef0902372acea3979398819706ddd8fa977bcdd7b30bd16a12d3
font_02_sfnt_off0000ffab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 17088 bytes
SHA-256: 78666ed2e92ce9ae0f15d50ec47d9f0c1efc282b4f9a851ec0441a6ed13849b1