Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b55e09162c8a16…

MALICIOUS

PDF

108.0 KB Created: 2021-07-03 05:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b54f8d98cf7fa3f54d4b73238b02bc12 SHA-1: 09f50e963e8c147445785917657e3e1a82930c99 SHA-256: 53b55e09162c8a166588cba68e44820ced69109c31c72d2fb68acf363b7eb5fe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest an attempt at SEO manipulation for link farm purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48f4c0249---51930293182.pdf In PDF document text
    • http://bigband-ulm.de/userfiles/files/joxakazepizonodolaw.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/xefiderakuwaxivup.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/76aea0d0a65c333527b18e42d5d20eee/dolotazogufedurixanilam.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c7e98319---26605962002.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607129b692f00---11135976947.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/53156457055.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/93338949271.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tidovufisar.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/97893311947.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6238da5fb---fotaxowilabit.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6509ab71---12066613543.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a499f91a3ee---dolonuvon.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608392331d784---32301845376.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078c36f304bd---lajazabepuburi.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160860b9073407---94941486727.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/24998202205.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/56085806076.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5a145dab---zebajezakes.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ee6e0bf8---56532114949.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vubamidaxuboxixasa.pdfIn PDF document text
    • https://thechoose.it/file/jalapivojiduruba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=write+the+name+of+the+following+compound+naohPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14364 17276 bytes
SHA-256: a4d28642cf34f9c4384033829b5d074e0442e3e129a92f2f7e585d3f2532fb7b
font_01_sfnt_off0001711c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1711C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18933 11080 bytes
SHA-256: 14d952bd2c6efd6b1743c6cd0360057f6770355d69d78e6df1be3c07ccfb9efe

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