Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1a972e07d35560…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 10:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f8261c8ae2654b7a7184ac3af8baaf2e SHA-1: 9261892689583801d68a73b896706951ac551561 SHA-256: ad1a972e07d3556081060a8b55c3870bbe24034bd117d3db2c8c4013246cce1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sportnazona.bg/f/uploads/files/30240927878.pdf In PDF document text
    • https://pacie.vn/web/uploads/files/79171793338.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167cfe06e4---62509637399.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/012cd3d70b847bbc6ed4b283513f4843/sixiribawapusexonatod.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4453b76e---49212703843.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e392a738---vogokuzigulazas.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ce304864f8770c7c35cd7d5df2744120/ruzitasukokafivinerosif.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949dda53e4e---giwegilamad.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/90840049490.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/fumolitemaxabimoga.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/kubob.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/49907707716.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/78511627526.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tsnojremcigckpsiv4liuelcp6/kobezobi.pdfIn PDF document text
    • http://remobudostol.pl/pliki/leluxoxit.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098786c36031---zamedipiwolaxuwanaxut.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/kijanozivasuxaxejax.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/zarizugifap.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c14e8d4ed021b252a148370bcbe39c5f/vedebedugibo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051618341238941.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/venigasirasabefabejidaza.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93a16af2d6---xodonatefuvatovaxase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gramatica+espa%C3%B1ola+pdf+primariaPDF 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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 18868 bytes
SHA-256: 7dfd16566f55f47fa010b0329c093437d48027a7f1ac593639480c0459a37bac
font_02_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 10920 bytes
SHA-256: a2732acd59c816bb31b9f0933c325d9e40c548e96b466cc3bd7dc8b6a84dbb37

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