Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61d5486ced9f165…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 00:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d13777851214e74e755f9f3e508af269 SHA-1: 6497bb7880637dc15b13c8fac7dc5c5f7d3de2bf SHA-256: d61d5486ced9f1657622778e9d811d13c612ebc538378591c17684b1c734e403
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://tw-tms.com/uploadpic/xw/files/gekesoliduzenofawape.pdf In PDF document text
    • http://daydreamspin.com/userfiles/file/3745601221.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/mafiboxiborenadigomajale.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/setamatexexotuvesovoj.pdfIn PDF document text
    • https://asi-filter.pl/files/file/duzarobinanoketake.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/20861658402.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/90175860621.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/zejaviriremu.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/burenapipelujujigoti.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/52970218936.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9588d742b---zeroxasabilibumegovu.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/27232547185.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/15017690677.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/zamexakovuputero.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/03992f71f5e4636aa4ac2358cd8733ba/74704353818.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/29580624643.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/sesolud.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/75205094190.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9602f1a856605295746b3ddfe47b68c6/lusoxem.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/95279653459.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/dasajazuve.pdfIn PDF document text
    • https://stotex.rs/files/ladofikobibuxevosavob.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/dcf2ab5b9d779ae877393997f08d6d59/76073728810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=export+excel+to+pdf+onlinePDF 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_off0000b26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26C 15108 bytes
SHA-256: 0b7107f3035faa22c30a89f4feb766d30bfe7dabd0483999d95df2f06c0ff045
font_01_sfnt_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 10368 bytes
SHA-256: d53aaff5b1b2d395adbe2e9dc91aba4f3a6d4b469ac4f060da87a572f9dd47a1
font_02_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1