Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25d1370bcf7a053…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 04:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ad3ccc17692b1f41c236705a65987b0 SHA-1: 8f7864b56fce0450ca2d0ec50d54f99b9a5bcf92 SHA-256: b25d1370bcf7a0534a75235ca48ab981976c015befd2ac058c0a388a7e019aad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are also PDFs, suggesting a multi-stage lure or download mechanism. The presence of a 'download button' heuristic further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=instagram+private+post+viewer+app PDF link annotation
    • http://studionegro.net/userfiles/files/rasokuna.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/89291648802.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/vatefiriwelerudesidefel.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b42d9fb1d---55050133651.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/sibewodetowivezawe.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/gozodidalazura.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/mirelidi.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/tixig.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/minemubaxuvon.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313e82d342a---65560984791.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/55701219669.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/56274432179.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210913131646825790.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5bca7923---27065450959.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/17679921361.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/56826880389.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/66207636454.pdfIn PDF document text
    • https://camelcarpet.org/d/files/39188849540.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/46894279088.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/cf83c3a7d69fbf11ea4270f19715fddc/93606193316.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/1355868860.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/losezagajarawevoses.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_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 17012 bytes
SHA-256: f5df2b84ae3563a9f6c7799398c777cdd0133fa53eda5902d4a3a1962875537e
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 10652 bytes
SHA-256: 919cc4d5d580b16779946e380e6f28b7ae7ada3c8e23b22cf4947bae06f7a259
font_02_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.