Malicious PDF — malware analysis report

Static analysis result for SHA-256 0427ec503c7066c0…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 11:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8879448942fad2e245472c9e51da81a3 SHA-1: 73eca466c0cc4f69f6600529018e33af5cee7df1 SHA-256: 0427ec503c7066c0142a5c5f4f6c7cbd585698104d412e2d2e2f63ccc8aaa4cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing operations. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://garglob.ru/uplcv?utm_term=math+worksheet+generator+algebra PDF link annotation
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086b077d6fdb---22460392946.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/12068930560.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fe34b88d9e29f25988ec158c28d7768b/befobuzurivonusana.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/33817938807.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae112f40e36---36443580836.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/wowuko.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/fa345c149ca6cede8bab19c19a6b6ba1/96525113921.pdfIn PDF document text
    • https://alutat.com/data/file/bipokufozafuzokidosivovex.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d000b3ca489---22569605616.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8a3e70e32940cfd3225d1ae1feb1c800/xaxelajetatabusaxifisawo.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/fikusogenujubukebiba.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19524623960.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210629163218222068503.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f954c1795---sarozini.pdfIn PDF document text
    • http://samtekelektrik.com/files/71225081149.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/pelusadezoratop.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/70055144756.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/rijovomotoborerawom.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/71073943808.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/vuwatokid.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/75963792588.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/09d7d37b13d475d5de827d717a76a76d/fisofenorizemiwavuxekib.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/64202689851.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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 10608 bytes
SHA-256: 248ad6498d9011b7dffb4b954153a0382da788385264280eca21dd8cf21accad
font_01_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 17796 bytes
SHA-256: ad22e682546b5350ab6b5a80d8807164f8ed0905b4f8ebf9ef4c8c8d16bb8025

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