Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28e849d948f4577…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 16:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae4b8cc7e05b52e2150b549839c2e12f SHA-1: 8e574910776deee3a8d730c33c7d990f7e3d41ef SHA-256: f28e849d948f45772a1560672bcedfbdd6e1f75a4b1fadfc205ccb5057bc76cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or link-farming operation. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161416d47a7630---83596522311.pdf In PDF document text
    • http://www.fonfe.com/uploads/files/vinoxalujutis.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/sipujubisasipejife.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/razelolulidofuzipab.pdfIn PDF document text
    • http://cochemical.com/upload/files/60517533351.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/73721833881.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a4b8d5ca9---gikudoxadipigozim.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aac2c3eae---jaliwejewesafituvegojofe.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b11ec1c4a---pidetebapalaviresawaz.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/28123226640.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7d4bf0f5---renurojunegitejujexo.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/20186437250.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613846736ffda---81968522422.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/76340003416.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/4846337856.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/mukifojatigoxoviwepabuxo.pdfIn PDF document text
    • http://proxima-design.cz/files/file/nubidu.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/wenogokezewolineditiki.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/65256846264.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613054c201969---pubirogisiwuzopuvepim.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/62013030511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+photo+app+for+android+2020PDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/55844132559.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_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 17088 bytes
SHA-256: 7a932d304d4dcf2ccf069a907d986d697d6d85910f5ea27c34f8ed98e16a2515
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 10844 bytes
SHA-256: d2fc8b9ed57464810185690d17047dfeb4ee243c9023dc87d2a6790c21d6cd1d

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