Malicious PDF — malware analysis report

Static analysis result for SHA-256 003fc871961ba35b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-08 02:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55c1ade1033772ba82dc89a9a3fb7009 SHA-1: 598c078b252a317c84df8fc1c4cb530be8cc879b SHA-256: 003fc871961ba35b03c902970e76a70e1908630a1f006529b4c10752748bbdbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=iphone+user+guide+pdf PDF link annotation
    • http://bethanybaptistcolumbus.org/clients/75549/File/4697891432.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608899e6de9e3---7301235324.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/duligos.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/jakisifofelowulupep.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/61610506720.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/79030255958.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/mefizezanomavifoda.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/34183678292.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/selaxuwonalo.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/461b3ed4378b5962034dbc5efd60de0a/wugituvogixavefamu.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/jijotegepenuxugodovazifis.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/1616278442.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/04pdi5f6rhbn1qck2mutc00p8o/75299974021.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607578a4bec1e---fatadumevujofisoxafabo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d448ef731abff62f1f5378a9d8f32e20/55565999287.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610292dc209ae---rinepimewojareg.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160763638c41b4---14798381899.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/biwitezuvutugukufofega.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e172602e---lumokavekuwelurirebula.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/qhdsm7g3chg5dij9uhhkijs0nr/bobosoturitapuzaleguvupan.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210811_35DCBB1DBEE27538.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_off0000bb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB18 16148 bytes
SHA-256: d27cdf298eb8e38e0e6238d6e54bcf8430312f6ae9d7cb88825663afec9c5cb6
font_01_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 10520 bytes
SHA-256: 541ebe2d39c03b951f26afa06e195c7f249988fb789b5a0e364945eafc448111

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