Malicious PDF — malware analysis report

Static analysis result for SHA-256 5776180439172f6c…

MALICIOUS

PDF

88.6 KB Created: 2021-06-26 22:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3fc3f607b3f796874a1272b4cbe17315 SHA-1: 81c2eb1dbe433999ff1b71a2f9904be819c96ef2 SHA-256: 5776180439172f6cffaa6f1391c0104b6e06331ad0a492254e216400bebd7212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6544i5gkokg7e79d2qknome2n/tuzora.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8c11071628484d463f045b4203fe2a3b/60668067976.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/aee2g6drl6o1mr7mupk6vcog20/solazewetegilepub.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe384d1e3b---76438443913.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2ssk041ksit16uqku1p6bsdfr1/mopodaninutuberakav.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e8182bbe2f82d6eaa8554f4acf2c3768/taxetafelomixeji.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a510bfe4968---jejakuxomefomomekorulor.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/63363837632.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcd3b2d89---735575464.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/90328321219.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/supuxazilavolipo.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/kuwigitovoduvupasonib.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/91790814212.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ba00d217---sidiju.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b590c72d3d---buluganetozofufop.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9964cd3d12719437346fcade21d0458d/luzoranosunodofite.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j26j4s6k2o7pkgah2alodnj227/bugozemujulebojomudif.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3eb9b6495138ee4e9f9df1602b416824/geguxizuzowironu.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/72905130054.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16088837781a22---88004575344.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/fb636d80bfff0b331c844c971008f577/49617266706.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf1a1af111---lipowe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3kalc5n2r1qmv6uerdep8t8np/tinajexolopufixapojuvivuv.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/77srq5ep02f9gi3apd4pn8nis7/nusasobaduzibewijafilud.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/57487065895.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c623f12be09---81163641381.pdfIn PDF document text
    • http://simonide.org/userfiles/file/goguwejak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=case+western+graduate+tuitionPDF 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_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16788 bytes
SHA-256: 1b8b4d79cd271645802d2d9049e47815de3cbf7b8538a4addf5fda26b74354fb
font_01_sfnt_off000124cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 10592 bytes
SHA-256: cb7c5274bdb56499f470c18b09107861652634398bb4c9d0b8c416d1468ff46f
font_02_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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