Malicious PDF — malware analysis report

Static analysis result for SHA-256 9934b49c65ee1c70…

MALICIOUS

PDF

96.3 KB Created: 2021-07-01 19:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0bfba8a8f42e08c8370fb9cb27ee163 SHA-1: c3556c3f6cf7f134f4ba3030f5bd371ebd325d0a SHA-256: 9934b49c65ee1c702a26a533247817a40d338799b0ccba97e540d31fa4d18aaa
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hy-concrete.ru/d/files/xijonesitopajajozopak.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dddb1770f---56767436202.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d34ee0564---sesijepubovulopobud.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1d53bfe1---25962195348.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160935c86af78d---82388954884.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8d78b6cf---73484365770.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8ddc3bb249f0755bd1f6c63f8b4d5bd9/78694081973.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba33073fed---duvabimefis.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/s88nt2j5c87utbh3fpl0s24mqu/loritojojizu.pdf
    • https://a2designbg.com/userfiles/file/48884501167.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c9cb397899098eeb94493080ab437b05/paforavefatat.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786ea9bce8---tabak.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/pesozozutevajigexenovuwa.pdf
    • http://tscyw.net/userfiles/file/20210628024938_8nwnox.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/24227901945.pdf
    • https://bataretak.com/img/files/file/lureginuwavibuzuf.pdf
    • https://agatanorek.com/files/file/95855519571.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beac3a33a4f---75470589347.pdf
    • http://donghotam.com/luutru/files/48532425111.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89e2bb0f4---41942184887.pdf
    • https://alexandrapanayotou.com/web/images/static/file/vasumonisivi.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093589255756---zonevaz.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/t0dmmcnlkt84pt81js26h4tb7j/kuwapagelomobuwe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=solving+first+order+linear+differential+equations
    • 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_off000113da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 16792 bytes
font_01_sfnt_off00012bec.bin
4ae55b74129fa5226eb39aee4712873036f25ba87de58a22a47a1496353f951c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 17676 bytes
font_02_sfnt_off00015aa7.bin
487bdbf7095093d23daf6c828f5049b2b9306bca2be94547e8635a684a3a45d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA7 10916 bytes