Malicious PDF — malware analysis report

Static analysis result for SHA-256 4111eda5cd58b947…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 04:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 340bdd514589acbddcbe0420b5b65019 SHA-1: 26bec69720a2ae552c4f83f27d29ffb4df142bed SHA-256: 4111eda5cd58b947f9de641909e9838e666ed20ff7217ac2cb9607cf0d0cfe7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://goldenpeak.it/userfiles/files/7809626805.pdf In PDF document text
    • http://baodieptailor.com/uploads/2021-08-26/images/files/sabufidabekameloba.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/542bb4827b7ddea11ec90c669c72e619/nitalezevubejoxejali.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2041503bff79f684d8892297335e272f/lugunitonulosovilupumez.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/46672308719dbc7d3637d6a234d45bed/96961558979.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/lipanoxatixipofofu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0871cbe473---31403594052.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/50417056781.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/totubaxuvubewofupibume.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/2382705641.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/kafasoxidanavejadexa.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/45455377763.pdfIn PDF document text
    • http://df-2.de/images/daten/file/zodepasarad.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ce5ce019636182a0b910db8902d11f43/79198782512.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/lixozakugosijuwugapab.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/34389637292.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610a8c056a4fe---59085424214.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5677b1e8c77ab5068150c401cfad5b69/diwinolenabovulugudo.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/zeteruzijaju.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8adcbc1ac820c1255dc70bcf1f89360b/92774458047.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/f38ba60d773a806ba63059b8ed4a928d/kotosurugileli.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/96904329718.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/xaduzoj.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737118f0ea7---nazavi.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/linegoxapagow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=critical+thinking+and+reasoning+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_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 11020 bytes
SHA-256: 04b03057ffc60be3cb2b47c064fc201efe298cdd79dc187b3f4fcaa91315e617
font_01_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 17136 bytes
SHA-256: 63ef72b26e175b6c1509746f69cb3d97a49a58cf7fc80a131199fe9de0b31610
font_02_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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