Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4db063b4d9a41d…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 23:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cedc9cac99757d6f375b9700f0c498c SHA-1: 00d8558e19268eb6475df1d20a4c3c38c876a4f9 SHA-256: 3b4db063b4d9a41df948334aec7a8af05fff5580ca024e39cfc29810d20302cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues to its purpose beyond its structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pistant.ru/uplcv?utm_term=innovations+elementary+coursebook+pdf PDF link annotation
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/59868469955.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b669ff2235---lutajumamujazikipa.pdfIn PDF document text
    • http://cga82.com/admin/File/52836542946.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/305134473cdfd1deb13409ec8b8754cd/gusaroposizixol.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e30caddde84ee9d5a8ecb611752b572a/sadazifo.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/57668129661.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ef415f35---9490388624.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/73316810030.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/74995688786.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160848533913f7---febunudilorek.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/muzalagomizegurolugo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160872a8aa044b---rijemudowuxagasefedipa.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad8db66de---resilovibakazemokiputinit.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f4beb166e772e6dbd0abdd9acb65b6d6/81611131083.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/96b1886d37ce3ba2ef00f73d5c0e7a40/pamikoxa.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/61706209533.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/83005893312.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/39677779685.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad53955cc---nizagesoxerepajujux.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106300818.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/nofonugugapedaguketuxaru.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/wumenoso.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/59fd4870d67a9ae9e1b20dd885d96bf3/gifikowobasunolewifiz.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_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 11244 bytes
SHA-256: 3d3e9d5a6ca486bc5aa2c3a83f78b3867106cbd2e7f5cfaed851e2abbf209797
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 17632 bytes
SHA-256: d756cc093bcc9443633002169c5e2e71e8d1c7b21fc373db6c90791a8ab50f19
font_02_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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