Malicious PDF — malware analysis report

Static analysis result for SHA-256 41086dfc49ec1d33…

MALICIOUS

PDF

115.7 KB Created: 2021-09-07 14:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc5d6501e0c72194fbda8a8bd67b8b44 SHA-1: 3b32538bbe3a7756315fa5e22dc72c81ab76a729 SHA-256: 41086dfc49ec1d3304dd424069ee2ee0ebb586615cbf0e24f853a26a2b1b45ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and 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 URLs are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2psvkceqra4jn6o330bgototu0/jamamobaxulonasojewaruram.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8b2e7b68---91479939620.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc2789197---24032829124.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6s0jm0f59nn2t0sn2rg6aqtddf/10312462826.pdfIn PDF document text
    • https://tigaintan.com/contents//files/vimemat.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/xagejuxojadonuborinif.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/52179791672.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd35ec768d---ketabitogan.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kixob.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9c717d4e---jodajunawariva.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2ad905892---33354232084.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee137a5a71---tedoravutiladawik.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/pazelejabuluboxeg.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210702095756.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d66edc80b58---pafokera.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/86906289045.pdfIn PDF document text
    • https://unosms.us/userfiles/file/tawifuderojimaz.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/59528490694.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160822df452d4b---zabap.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ad26e31c66e18b8a8148881520f99d63/menor.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/23241434243.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/nimutakazamezukavefam.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vadusikijisiroli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=vercelli+book+pdfPDF 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_off00015e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6F 10284 bytes
SHA-256: ca7cf00c3482dd152be41ae2fbc8380a0bbd45ded5dd313e21a9dddb05e35bea
font_01_sfnt_off00017560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17560 20328 bytes
SHA-256: 32a7462a553588b8036deb0682dc71be678594f91d52e6d2fd1cd7e15209c244
font_02_sfnt_off0001a972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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