Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4020716575782d6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 21:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2219886d586ac8a86ba09d695d4236a SHA-1: 769defe32535edb58193b03191431c96bd129917 SHA-256: e4020716575782d63ae2e2490a246162ef75ea797588d8db96c4b06e13b565b9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to distribute further malware or phish for credentials. The presence of numerous links on disposable hosting and compromised CMS uploads strongly suggests a malicious intent to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd22cbe4b76---kopolikuguzomudifoxajolu.pdf In PDF document text
    • https://digireg.ru/upload/94845384221.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/f3118230868bd9d9453e417dc903b395/xifopegujuwuxofevu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19ef1f9f9e140787262e991a010b1086/wukejizewagijizugo.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/1628254375943882594.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/zudiwaxekebosokarikuna.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/93171423671.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ebaa26f64---sukiwakejuruk.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/36551633565.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/sidajapat.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/36365646916.pdfIn PDF document text
    • http://landpas.pl/upload/file/salasewejatinutusez.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/rabifazufu.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/98107325170.pdfIn PDF document text
    • http://ahchala.com/img/file/dolozavizitowik.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607368b89c4ed---taximoriv.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/47820077432.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/9fbe9b8d66f54dcfe56c627b955535bd/77745813519.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56122bd2d---zexudepala.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb7b164d6---60788205520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=high+graphics+android+games+offline+download+apkPDF 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_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 11140 bytes
SHA-256: f4cf7d03df6961d0339e0ef52245e6e36d795380199c362624700fdcdffe9dcc
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 18140 bytes
SHA-256: bf12f0c6f633af5fc0da4d9010a491d8c81930e759d9b7dfaf3f1c9b330e1536
font_02_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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