Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e35cd3e40f6eb35…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 18:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5450613ee4bb72f0337cefaa4d8a5ba SHA-1: 3cebde339d90f5c2e52817244468eeb9a2c44d98 SHA-256: 3e35cd3e40f6eb353007d036746bb4237e72522b87d39c3e0aaf3eac67713f15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan threat by ClamAV. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=python+tutorial+indonesia+pdf PDF link annotation
    • http://afro-safari.com/upload/files/80798718017.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc806fc0525---vewawofazowoxi.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/jurotesazati.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1481334072---6637482044.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/82544306280.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160836d74e0d6e---juxilixexorenasedavu.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/12773333140.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f2b037d4---41813093468.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/99890270972.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/jamedaximukapozu.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/mizejumevuzuponilatopo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/4e093e5166fe1061905260d9469d104f/75409086734.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/967856790.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ddf7d7b4---legef.pdfIn PDF document text
    • http://netflor.pl/upload/File/9748802905.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/93633969263.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ournl8nc3mtabd6pm2v0bh3rf3/78289750458.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/zemojatidoli.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/24367422432.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/rokarugonododubudo.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/bigijawipidurodir.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vb56ribm5a1g7ls14fernil7ti/zigatavi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qu43rrc5dto40i88d380giaih4/82297169886.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_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 17760 bytes
SHA-256: 975709443921b126df029a26604a0a5d25112496b5559a2e1251b207b8865f83
font_01_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 10812 bytes
SHA-256: d06b8abc3085bb28adb24416fcb116cb6aa7546e992f687b2e7afa239eec242b
font_02_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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