Malicious PDF — malware analysis report

Static analysis result for SHA-256 b539412306467303…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 05:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27f6cbf9a0a6157d5a59e1950364b1ed SHA-1: f1e0be5d52ea4d6a1ad39f1d91363713a69a4717 SHA-256: b539412306467303839452d5c38cbb9d20bd64bf8844d861ee9f6415e988b3ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, a common technique for hosting malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/9hadjccno05k1hfidufjb9mlt2/39547015994.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db5fe85eb22---zusaxos.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/pukeduzudamidizafime.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe8b416215---64324309184.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/zatifenulifukabawo.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210824_055752.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/42900327052.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/74472336480.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/86883506143.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/45081646840.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160803a801406d---kudetezuxeminidowebo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb8e5b5421---96453152743.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/19392032358.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/36091176338.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/segapeforo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/40504270720.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/dufegixivopunugibezixa.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/sosomazonere.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf51ac10f82---71624523483.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/19442402368.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/6092997936.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/parotetagebefoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=2014+mitsubishi+outlander+sport+es+owners+manualPDF 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_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 11260 bytes
SHA-256: 22867be531451362a9966a18ecfefc11f773feede97e4dbf694a7d4070081494
font_02_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 18708 bytes
SHA-256: 4f5403da9d470faa81b19e263d1757eb960cb89ba9c6a1f976c468704ebe7ad6

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