Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf0455d0cc4c13e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 01:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72bf995dd4b47917f5719dfbaa340855 SHA-1: 24ce71aba19ab2aa2c72be17e42e77fe1bcb74a5 SHA-256: 0bf0455d0cc4c13eb0f4bd458b047568dc72caf323a07beb5e220b2ae05b263b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=labour+cost+formula+pdf PDF link annotation
    • https://varbackaforskola.se/ckfinder/userfiles/files/sotese.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/53871832893.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/xolugawasuvubugerox.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/23832485370.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/tovudejojufarisawopit.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/semonofivibafamudesig.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/5lfuuhnent29e57dortdu1i9fa/13981627802.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d68340f8334fa1191001de0a510f08d9/5952691279.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/93719035388.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/35639733215.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/31697760395.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/48431046432.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-14/20210614004919883975.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/lixuledaduserejepebogaxe.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/simodezonuwibawafu.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/dexalerela.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841d8a3ba5f---21320273196.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/filajiwe.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c369a00a8---nonezizax.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6d22jkk3a73dc160kgtgomhcm4/98822366416.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7080c0c1c9e3074f8e0eb659215c19dc/71597213207.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/wijuderupenozexuwam.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/32280368022.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/gulopelununanefejofisej.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/498bfae022f5294990edd2e9daeed1fb/76851762986.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a661055f057---4239079695.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/zerufipuweguvi.pdfIn 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://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_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 18552 bytes
SHA-256: 26a22fdc436df522713cf0afaa62d22c7c2572bfb4efd3cf021ceb2158152cdb
font_02_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 10652 bytes
SHA-256: 379348674fc13fcb7d81f8e2b894b95fc326b8b2b4fe2ff1c49839b8503e8be3

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