Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba37b247c7ec2ba…

MALICIOUS

PDF

87.5 KB Created: 2021-08-16 04:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 848e6d65fabbe749faf3ae37cbaef66d SHA-1: 9cd3eb77a6a8d1929849da497dabfbf05b205d8c SHA-256: 3ba37b247c7ec2ba57287cb130b2ca11584e1de4235a29b7d9239d19e0c10e0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=pals+pdf+espa%C3%B1ol+descargar+gratis PDF link annotation
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/74330448237.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/gawukivofokige.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/xalaluwuvefu.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/bumapobija.pdfIn PDF document text
    • http://hevolta.com/upload/file/gatuwobedikowojif.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/rokimanilapo.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/43367413808.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/cup6fia2rjqgv3s8lcej35vq70/pizap.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160999b4c54696---93658141536.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/wubuf.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/gilepenexotekewovigoralof.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/98282038273.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9492e27b75---jipewiparero.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/21084722112.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/7dp099b6lri4gc2ptjqh6ba534/86732751501.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/xaxuwiwexejeko.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/xutukidapufovaz.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611207f6a77b8---21447217960.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6be7bd096---pikasizobufivurer.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/48356957747.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/939cf7d0e5d3dc366f31ddddac16fd6f/fapelovove.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/18942465804.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210717_B1BBC10B977A7E31.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/14573979415.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/58036192545.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 17576 bytes
SHA-256: 6ae4eb6304ac4c6d0ae91670b5b08fee1a2fc79387166b51eda9519e80f0584c
font_02_sfnt_off00011bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 10896 bytes
SHA-256: d257b110574defe2abd55bf2374da62c9487c814b62d45bf1fe79e32cc5abec5
font_03_sfnt_off000134f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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