Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b4633d187e9aee…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 21:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb7bf35656567646b0a8c329525c9ffd SHA-1: e1562cbfa8e3b0b0fa17b3f9df1549027f4be7a4 SHA-256: 03b4633d187e9aeeb8e0c9cf17428dc3a2a3d0d5c4f13e5cbb3292b6105d7288
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it's part of a phishing or scam campaign, likely attempting to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://artechq8.com/beta/uploads/files/wilenujad.pdf In PDF document text
    • https://aathichudi.org/userfiles/file/nugoxipadinidufex.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/nowowalamo.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/22941084872.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ab9331afe---zenubefivubewekefemij.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/99540861383.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/73432079484.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcc5758079---jebilotudaladuwozebuwa.pdfIn PDF document text
    • http://videlec.be/ressource/file/wadufawos.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/45262113304.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/jejuwugolapegoporoxati.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/63vik57s07joht3j7onhfm6ago/61350121414.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b6418a293---3935949020.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f6dd801dd0ba755d57ffec653964af69/nonazowadevisuwinuxit.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6c1c26d82a46a9eaaf65aac8fa436baa/gokuwavotawe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcbc50a7a---nenigunitatev.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/q034njri09geuj2sg1hr264p43/devufudepurasugutujojo.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/4ca4afa5c92b3e743687b6fffb811896/23502569795.pdfIn PDF document text
    • https://maility.pl_adresuserfiles/file/bixajuzezasatefovuminoz.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ac28a34a839569bdadd7b217a3df6c68/vivagamifusesuxifab.pdfIn PDF document text
    • http://soles2walk.cz/data/file/xitaxukitawisegi.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/13904160513.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987529bf0d7---4676472638.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/elhjgmkobdsioehjo1ukd54l72/jupedukifatazoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bsc+agriculture+practical+exam+model+question+papers+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_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 11364 bytes
SHA-256: 4463857e75754d3f4b3d50b96b4535ae11bba33a1996f488c41689243092ca80
font_02_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 17860 bytes
SHA-256: ab59da0c516a0ac97d61502f22d813611eed53ed43c555a3f64987f75e86244c

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