Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dae488fb3403d5b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 03:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ca26d4a35f734326d30eebb5d19960f SHA-1: b2baa307699b50aeafcdf153cd1254a6df510853 SHA-256: 6dae488fb3403d5b3c8ec5b130ae18af74e34b0075860cd36e8f85c90bdbc17b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, many of which are flagged as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The file's structure suggests it's designed to lead users to external, potentially malicious content rather than containing a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://saikekanglun.com/filespath/files/20210824071539.pdf In PDF document text
    • http://beiks.info/public/file/tidurera.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/mibovemiv.pdfIn PDF document text
    • https://thehouseproduction.net/file/demetufasapumaluzedabamo.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/nabunomo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd4c827341---83737584773.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/wubuf.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3ddf85150e92643c06bc3893cab15de0/37868751089.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160745ebe256ca---fajowopenisanozuwazurat.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/76837947927.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f41e8de9---didalodufusopekumirel.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gipoz.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/40286131756.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/14055353441.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/34094343455.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/lawanijim.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/74708770810.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/nufewugijavasezekek.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/majusifojafonafizelu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610466687e3d0---vonojakubinisajodeposiv.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/59097213505.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b752462323c---79835917988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=geothermal+energy+notes+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_off0000bb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB60 11008 bytes
SHA-256: 4ee902d09884ec66610a29b9328689a918a3b6fb5be0d1f81170c6dc2095c524
font_01_sfnt_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 16148 bytes
SHA-256: 84d73e7826ad1af799dda1b641e1a19a42b6ff97af35621361e66f9dcd581f51
font_02_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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