Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4388ef25fea310…

MALICIOUS

PDF

95.3 KB Created: 2021-07-17 03:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3978c253ffa0371249a8e5e79b555947 SHA-1: def23715ed73726cbb3ef36006ab0a4b1e3808e3 SHA-256: ad4388ef25fea3100b9d64360968670474418b2aa0d6ce7f4cfa0a6aedc3ec57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to external content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/d4ps5vs7bbjeqse1h2bj440od4/19512617290.pdf In PDF document text
    • http://studiotipaldo.com/userfiles/files/93969842677.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60818c20b---kaguvi.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/d864d4b2d9ec0b65e9ae47ec2eb31795/kiluvawizumejawideto.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160984f39bb070---daxukuxesusifi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d79236eb2---xewisunutumivefim.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e87749322---zurilimupewadowafil.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/1dc3e36501b94b4ebba12fc4ef457fe5/sewibo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6171c16e6---93983472972.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4d73052ce23a80324860bded37d25b6d/jowaxo.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/82983575647.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/pexazekixev.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/tubonusuz.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/loduvuxamegimemunile.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/m5vuae4u5t2kmeje6ipevruemu/sakenuluguwipi.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/tuzesusezegamakow.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/xezomofowotop.pdfIn PDF document text
    • http://ilcaminodaugo.it/file/86631804213.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7a9bea6b4d59c482b2cd19d0527f434d/famukilalisi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf53442b927---tulezuvaragosimom.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/m7rrceqosq9mae9dub3qtpk1q1/ravowaganago.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bc989931d07---52940380536.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2n11n96q23fvvovc8soj9qkvn6/lipasojubedetuzejejakit.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bedc9490085---28265374010.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9f4467f13d5c98eac677811951d9a317/jofesavafizujo.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/sabupumogujeravisow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=main+features+of+mitochondriaPDF 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_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 10788 bytes
SHA-256: 6710695fdc6d21ca3ac47c4825efba48f10c8bea75b0f8c013fe02d0f46ad5c1
font_02_sfnt_off00013d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8B 18848 bytes
SHA-256: e921b6963377becbc7473a73c1bf3d41234f4c7b5764eb9c9651ea5fb93d3fc2

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