Malicious PDF — malware analysis report

Static analysis result for SHA-256 503d51139c1a4dcd…

MALICIOUS

PDF

71.5 KB Created: 2021-07-02 05:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1bd5c7c3207fa6d1352fb10e5860e49e SHA-1: c5d671bfada409030c0c1ac804c91d0bd62a872c SHA-256: 503d51139c1a4dcddfbe61cfd531b1d29c6484ec766575c300827d10e7d044c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites and disposable hosting, characteristic of a link farm used for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4d8og7gj7hmv0k30rill3her11/bumepatupekabusepuwonul.pdf In PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/pavolusoku.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/44871560856.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9614e5bf1---13352223080.pdfIn PDF document text
    • https://ksuskalology.com/images/file/daturasafetuneraget.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/55877ba711251fea4e7d3c8b1332e394/37505474585.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/faforonotafofetijifave.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b631f3b379---11377846683.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7o8lbi13sa6bh1atikrfpm5jfe/xipugivupipeguxevif.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f4ca8c566c3897f0ab45948812f788ff/21973514293.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/36224281300.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/65229630593.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/36390614824.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/74247323838.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2dd0242d7---povowujulikezizurojipovas.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ac816da5---fadisuvol.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2tonsd5gkl4nld7j9gkodupniv/66784526902.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/88390245549.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0dde49fd05ad388f4f4052c4183a2f38/70244472854.pdfIn PDF document text
    • https://beaszemin.com/files/81287160080.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/25a861712c0f8a3b322c983733121fbf/32740091381.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a68f80a95d4---fututolasuna.pdfIn PDF document text
    • http://gptools.net/userfiles/file/46544403459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=types+of+probability+density+functionsPDF 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_off0000b77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77B 15640 bytes
SHA-256: 5cc02bf956c8bfcfeda116dda66b5d2088430414541cc72828909bd887ca851d
font_01_sfnt_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 10928 bytes
SHA-256: d6d278217de6ec999ace6b7126ca70e77effbe6ba9f75469b25bb30243da6949

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