Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e829b532aae4680…

MALICIOUS

PDF

83.9 KB Created: 2021-08-19 19:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c23db4faa59c18c70dc35299bb1eda1f SHA-1: 42ee8a970eb845cfcb44862d97ab33fa39b9c608 SHA-256: 5e829b532aae4680a747da5d6e54505bb8e15d62837ba80d7882640f43c225cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting. This structure suggests the PDF is acting as a link farm, likely intended to redirect users to phishing or malware distribution sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tpdw.pl/userfiles/file/noxadakezutajezitu.pdf In PDF document text
    • http://adveotec.com/img/file/59441861132.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/82643927569.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/43710627603.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/nasivovasojisexur.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e5dee419252a5051ecdc800ae743a9b8/rojilawalixukobe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc492a221d---vodukarosoroxigupixarud.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607622fdcbd14---vavelotowude.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6c7793216---94449041274.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0eb2d8d91---18992930848.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856ff9eab82---xufozatazerufasevokoxogik.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/numusiwujiredatenawan.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/45765999934.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c234c999a---getomise.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/tonelaxajalubuj.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/zutugulavijegetakexakazaw.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/xijexawasenexevifadu.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/68582657312.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/34015707760.pdfIn PDF document text
    • https://shibbirs.com/media/files/15561008648.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/90de88fcd5554b5a166e1d676976a041/41118248987.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2ee3f45b---33974089293.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/9191784529.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/juzifij.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5ca0f2ddc---xavubuzezirebep.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160987044904dd---97624431525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+learn+javascript+in+a+weekPDF 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_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 10732 bytes
SHA-256: 1b45a229c8ae7653ddab80b07604624d4e41a4f9b4e437451e20a5ef94f906f4
font_01_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 17260 bytes
SHA-256: efb10d4c2d0dec959ed3057f93929ac2f1094d442b296d23fd38bf22aa9e9775
font_02_sfnt_off000127ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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