Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb95d9dc16f2f75…

MALICIOUS

PDF

88.8 KB Created: 2021-08-18 16:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9b873cffd61095943282258b7a2be5a4 SHA-1: b7968ba36ae7b1135db54b27190467c0d25c4830 SHA-256: bdb95d9dc16f2f75527365df45a29e8c59fff575e9ccc9af66b17b0fefdeef10
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and compromised CMS uploads points towards an attempt to exploit user trust or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kagoshimakojintaxi.com/userfiles/file/linujunidajo.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3716787cc8e6fdd2d4465146369180d2/52368759689.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/46340601200.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d8406b0d---tezage.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zuzutefivojax.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/fe8cb7b8f1d979e032524412228a001e/5306334595.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/q1i3kdhc6d41inu9ub70uvng1s/97500655227.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/kigimopolutab.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/kuvolej.pdfIn PDF document text
    • http://iworking.vn/uploads/files/8675392175.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca20c84718---piwotej.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160768b5cc840c---53054988995.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/65649647690.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857344eb07f---67585978126.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796f8241d0f---zagifibibunerukod.pdfIn PDF document text
    • http://benly-carson.com/product/files/rowematovilimivubugoveja.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/vivibadebojozizuwufikugez.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210816160627.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/26ef45a2f9aad1e6aefb0fdf06351a01/8336262226.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/64972766923.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/dibavesa.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/lanitapoxufegevo.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/26028081625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fotograf%C3%ADa+la+historia+visual+definitiva+pdf+megaPDF 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_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 11148 bytes
SHA-256: f9645b0106adc3e423949a4694aab4fe3114318917700103211a3796dfbbf25b
font_01_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 24040 bytes
SHA-256: f0426a352a0adfffb12eb4e85937c6b5fd40a6e4b69202f89814fddb333bee08