Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50b11e75e343dc5…

MALICIOUS

PDF

77.5 KB Created: 2021-06-17 14:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ff00a38e4132135df9d02b61746b3799 SHA-1: edd2d14857f55933b56eb2f0c8225e7f457ab02c SHA-256: a50b11e75e343dc566bea21b0b9ec7e65bfd651293c2c3176c8e557d0ff78e12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple URLs pointing to compromised CMS upload directories, suggesting an attempt to host and distribute malicious files. The heuristic firings indicate a link farm strategy, with URLs designed to redirect users to download content, likely malware, under the guise of a game ROM. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=download+pokemon+unbound+gba+rom PDF link annotation
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hlj1anbtstsj8tk1gktsiomcn2/90886600921.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a16804a8c43---wemigowenegalo.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/50107368195.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/5be74as07ut8o3pbl5thsa2mn6/nuleditasalasezanawivubu.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8f2c5ee304638c02c636f23412dccef4/loduzujibumariv.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160914c7153080---nokunafojuxopalimejupef.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/60150118654.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160793d8cd893b---80757657943.pdfIn PDF document text
    • http://www.asslar.de/downloads/53140205297.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/govewatodulabizojom.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/4944533283.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/81563181050.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/18010382754.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/xexujeziwixezobezig.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/794bbdc30daf4af6a6df17af22c45efd/muzusumufagexegegusuk.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07ff3c3ae3---98041739907.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7d498151d71d2259b13f68eb0564b738/titikovetisovodafuwekov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 5396 bytes
SHA-256: bc424625cef0039dc61795833a05665442c583be31a4fd25e876d5694ff1ac75
font_01_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 11072 bytes
SHA-256: aec7d2c8f238c782b6dc3ca5a4a6d93bc6e847a2f09d8e598f6fbf38cd9f22bd