Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2d18c767f91318…

MALICIOUS

PDF

104.0 KB Created: 2021-07-31 06:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 2359113973dca051bda55b20e5d714cf SHA-1: d8b5da20864969aaeb5231cab7e145af082cd4ad SHA-256: fd2d18c767f913186462eefdbe32fb9023ebe7706337e749aa4451ed1644131e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to distribute malicious content or lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9532

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.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/af2cf67322310bc273fa83db28f10322/pabopepadusitunewo.pdf In PDF document text
    • http://beveragesgs.com/userfiles/file/getiwuxutedam.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/selafurazadowe.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/72117510990.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/simolelebavonukipunuwit.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/buburuwafalefutasa.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9550579282400c3725b9a49058f6eaec/69789291477.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/pobevasirezito.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/damusikikamupejovili.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608435514dd60---3556996615.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc4a790bdb---jaminudasupaluginexom.pdfIn PDF document text
    • http://wenxuezj.com/images/File/74331873451.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/wetaxejow.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4940d5a5896777a982716ed5e12cf6c/33469633248.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd464423cf---32683410517.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7212f1ce7724cad0e05b7fea9a660854/95577117236.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/76ifibn8f9krbjrcvq022nn3fv/tonukiwakod.pdfIn PDF document text
    • http://vo23.ru/upload/file/kabibafogidezokawonilan.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5304f23cbd64b05b3aedba94ed31b4fb/suzaxukerosexumilojizutu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/21e5ac66e1a46f0e18fb16c052bdaee1/58242825964.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/borusifajozekogo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d912c8bfa---53643513998.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a1266cf853fa8e0dee174c2e2949d9e5/xebafepelefabojekiw.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/389c84a20818df99e4c69671eea493d8/20173999226.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/xametuzuwisenilateroz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d59f5c3556738d783d7b5a3c43a4b333/87886796672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=media+moda+e+mediana+exercicios+resolvidos+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5A 16660 bytes
SHA-256: 3e1a5c08b99c48cfa263cac2d0fa4fd7eb77e98f3e485c9afca6077663a68f55
font_02_sfnt_off00014307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14307 20092 bytes
SHA-256: 096e2f7670ac3bb21e8d2251f308c84ac809a42b1d63e769e7999bc821a6a72b
font_03_sfnt_off000174d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174D9 10844 bytes
SHA-256: 9e8e81cd82448a2bd5341baa3ca50a7e59d42df7aa11d22d9a9243f11ee328ca