Malicious PDF — malware analysis report

Static analysis result for SHA-256 259e7c4e0d875bf9…

MALICIOUS

PDF

68.4 KB Created: 2021-10-02 10:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c8ba9feeb49d71dbd47c85a29619623a SHA-1: 0471884a543f14e173b37a87b7bc4e4919c0576d SHA-256: 259e7c4e0d875bf91f51f6ccd1a24f2b90de0ce2ad312f798d5bf9929fa1dca3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories or disposable hosting. The presence of these links suggests a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=restrained+retaining+wall PDF link annotation
    • https://truckforceone.eu/upload/editor/file/62450244459.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/58737567737.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/xunajere.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/xovobidofor.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/talosakubaxobigudiv.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/kowixinilowaf.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/dolarexemanesopelojovo.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/lomedatiduv.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/fuvusozojak.pdfIn PDF document text
    • http://skupka23.ru/upload/m/94969200816.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161363824ba42c---vukodofirogatovoxabivoje.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/akabujulagokofovorokevi.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/69169737961.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b567f8d880---26519277645.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/mafuzolilofasaribuz.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/devox.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/dolog.pdfIn PDF document text
    • https://okazionche.com/files/25261142515.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/tokakonazolo.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25914772709.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153df168c622---10313601975.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/82383479662.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/tapizi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/75e19fd1b682e5246ffe91f339c48d24/sunajutawuwiwopibewamex.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_off0000afae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 10436 bytes
SHA-256: df318673645064500418f24819dfb62b8cd4483b7b62a8ef51f79d7557067ffe
font_02_sfnt_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 14732 bytes
SHA-256: 105a4cd060af9a9bcca6f8b3904aa797e4b3f371a322e0772480961226586633

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