Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e9c2f9cea4379a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-10 20:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab37017f14eab607691fdb002ed36004 SHA-1: deec553c416ff59346684b452585696cf3373bc9 SHA-256: 20e9c2f9cea4379ac4d47d03f5a46e4595c30d9224fed2643a5785edb521f257
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=android+wep+hotspot PDF link annotation
    • https://vietnamwelder.vn/uploads/news_file/dikutota.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/37186404123.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cd43fc3a---sewekubalu.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/3343078189.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/nutijiratepowi.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/sinevinoze.pdfIn PDF document text
    • https://istanajp2.com/contents/files/dizadazasujikag.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aac4350469---zuxaki.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/savuvadoma.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/22524434920.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/rotilorupexepageraxukeze.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/21191776251.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/daxizudalejizupeb.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/dudalojero.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/ranudufax.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/xaruzobinepavogej.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/kefepolururupetisebiraluv.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/fesexuzofov.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/sesomuninilo.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/dafoxaresafotulugalo.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/selobaberozuguxulowegata.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3dac717b---murewazeleku.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210907084753.pdfIn PDF document text
    • http://sooclose.eu/upload/File/sufanivinilevewonuveg.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wazukagumik.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/nobededazaba.pdfIn PDF document text
    • https://mollis.rs/files/darixelezasuzajaporuzik.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9dc14bf3---79381467242.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_off0000bcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFD 10348 bytes
SHA-256: 077bec52610cf0a1649a60e9a418b75ad98f2f2116dfc493ec51ec45f53cc8bb
font_01_sfnt_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 15344 bytes
SHA-256: 7ef8fc3e7a60b28a0887ae429e2617c74e480f00d66d6df861ef205b6a738b97
font_02_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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