Malicious PDF — malware analysis report

Static analysis result for SHA-256 34454b6b03731f63…

MALICIOUS

PDF

106.3 KB Created: 2021-09-04 21:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84c4f3117dc75beb95b85cae2ac7c88f SHA-1: 5144fd5aaf86995545303de1491e306c72525018 SHA-256: 34454b6b03731f632478d7c0152cb037aa823621f61cd7ebd18c0ae7ea2d4a8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, 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 point towards a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b76ae88974dfa38f44168eb3ab7b289b/18319478358.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/33f566fc723c00252686993f30be236b/biwobujoz.pdfIn PDF document text
    • http://msiutilities.biz/documents/97859925053.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/kitakarujozazefav.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/97125631621.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/72986283601.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hl5s4sd3meubn40oul9lf6ipic/90098865439.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/59179092611.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/81093210556.pdfIn PDF document text
    • http://metall-press.ru/files/xosafelamedakuwatikuge.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/wosinowiletivaketajeri.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/39081188822.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/titomagazutopatimuvu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/41b43c52a288124a56e050de5cf473c3/421364816.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bdfa88e95eafe1f10c14086ca135e2c/pulipovubigabate.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wutedijo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c64391e6---90205203196.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/4073332150.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/felijipo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b984f4ac15d---xutejolapugozoturo.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/6hh5c459nnh7l4qin8ooce5oo0/xiwaz.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/worijemanonin.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/bexititubuwamiteke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=medical+prescription+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_off00013504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13504 20480 bytes
SHA-256: 9571f8a6d90e35acdc641e7626c9f703e45cec5b91a77e4848b6e9ec568d3b11
font_01_sfnt_off00016ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC4 10840 bytes
SHA-256: 6013e39527508f00d9acf4bf694f54bf6be466b694fcd86ab2d2ea4564051e5e
font_02_sfnt_off000183aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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