Malicious PDF — malware analysis report

Static analysis result for SHA-256 35db38d4a97948c2…

MALICIOUS

PDF

70.5 KB Created: 2021-09-04 16:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2cb9fe75f092730524e3632a82ce2e2 SHA-1: bc5867959cee2f1f21b14b4cde9a54f23401fe29 SHA-256: 35db38d4a97948c2c8bb2daaebd211ce080da7fd9f73bbb985c1f6b4215abb10
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to deliver a second-stage payload. The presence of embedded JavaScript suggests it may be used to exploit vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/90a7ac29d1282f300eb5d4df89b12656/76233728755.pdf In PDF document text
    • http://se-ty.ru/uploads/userfiles/file/kibubisedasoru.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090174348425---wabalirivufavixoz.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/22617740016.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/dd264f3361e368f905ae599d28e27c74/39312476740.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/52k6r8nni5r8jkutfphj2p5qsf/bizatimoxuwodujotupox.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/u7pjteagtse78u0uac0vei750l/63262521448.pdfIn PDF document text
    • http://thefertilizerequipment.com/d/files/kotigapixub.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/89682410336.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/f0a7c8b3b4631b724fae04ccb634d064/72137862944.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/diwuzagajamarozolez.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/26f384b4a6551c85fd5250e97fdbf79d/gemiv.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/74005188455.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/17308592532.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/mawale.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/siwalasenedirejogub.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/efieooqglbrustaq9ei8qf8i7v/rapodakeliperepaligo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2923217f---33727161039.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6850bd5178---63212952083.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/vorogusaneparuz.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/58005824862.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/wejaxomemuxoxasakorajizem.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/49432200054.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdd1bd0dbc---31128593944.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/5285045239.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/rubisilixojobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pl+sql+javatpoint+pdfPDF 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_off0000b70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 10604 bytes
SHA-256: 40fabd9327cf66be99e680321cebe4b195cea2c1ecbc4a04e437f3f1d2db7789
font_02_sfnt_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 14956 bytes
SHA-256: 419eecd9c071e5e15e27a05e8b80df5c8f8f8c908e9393df232724f6079155af

Open this report in the interactive analyzer, or submit your own file for analysis.