Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a38399876f0aba…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 02:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0b190480667c7f57ac8dad7f13b13e9 SHA-1: 252e16bd3de4842bfb473e87c6fa1884d033e2e1 SHA-256: b7a38399876f0ababc08d6984913f0ce1c59a66ad0db99f472fa89cc16e29fbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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 https://crysiq.ru/uplcv?utm_term=how+to+install+alexa+in+redmi+note+9+pro
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/609fdd983cad2743f607425bd6965409/45712302856.pdf
    • https://okinawa4d.com/contents/files/fogolizun.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451d90562b7---jituxorawojosamenofuluvik.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dd6d604934709ae3758e46fc7ae88929/tilax.pdf
    • http://hytechplus.com/userfiles/file/lawuturadizori.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/82828697685.pdf
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/sapuwa.pdf
    • https://sanruouvang.net/images/uploaded/file/liserumo.pdf
    • https://sushixusa.com/userfiles/files/33513814134.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161441ffe1d554---nisivuw.pdf
    • http://bayanairag.com/uploads/userfiles/files/sajumuvutanax.pdf
    • https://vitanov.rs/files/84712451296.pdf
    • http://dwornawodzie.pl/userfiles/file/18631397484.pdf
    • http://www.petersonassoc.com/emailimages/file/denek.pdf
    • http://fasson.vip/images/editor/files/gosokuxuvenosiwugelidaza.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/komesew.pdf
    • http://fsanaq.com/upload/file/210912074953242252slmgumjx66wr.pdf
    • http://sellmysayarah.com/userfiles/files/78824110573.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/99449090818.pdf
    • http://plnjl.com/userfiles/files/vuwudozijirorujavubupev.pdf
    • https://udruga-invalida.hr/files/daderojetogojevegu.pdf
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/mudekozanixizalulijugoz.pdf
    • http://ty-int.com/files/files/63482527958.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nodesuvedal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bac4.bin
888116f64ced312f97f0e0e7d21343f927880c72b7be52650ce155b364e1b0f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC4 10900 bytes
font_01_sfnt_off0000d408.bin
6c64b01cd9a7eef457b60adf3646c0bfb1610bbe4f3afd0033743a37d7769f5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 15980 bytes
font_02_sfnt_off0000fcc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 16792 bytes