Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d251bad4c43acff…

MALICIOUS

PDF

92.4 KB Created: 2021-08-13 16:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f28fd3111b4908db4a1eef1c2f84ae67 SHA-1: 8bdcff54ae8df63498651d2c4cf2ada296f45817 SHA-256: 5d251bad4c43acff52198617cc8dd96a10c1e2bb748be804e9bc2f446e8b0ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for SEO poisoning. The embedded URLs are designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c8ea266f---71536079047.pdf In PDF document text
    • http://stoewebdesign.no/userfiles/file/zibesavabosejitulugo.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/rotipekodunulujujavora.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a65ed699---93511903055.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210608162319461945.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090f47b5f913---52349287356.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6fbe1f6e66cb55775a6e380b3462b56c/jokanasuwofekananovemanu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f59f9ed9df645f020b0d566f9354aee9/19879646905.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6734f3d5d---81292214908.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088291499b07---8944595621.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/pibowerugima.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01f716ff1b---86439217408.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pnr3k23mth03imtern1v4hbjdm/1608015158.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/94034035631.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b43e322801---78301742580.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ae6cd975---gekolatoluderumeponirive.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/72074052099.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/nobilovebopokax.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/logesokiwotimiw.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a90019d3eb7---5284243745.pdfIn PDF document text
    • http://jejuecotech.com/ckupload/files/59524464867.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092adcc0a20f---39267758856.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/mesufegafutavetul.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/80918067118.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108293f0956a---vawiwubodavevezoxunigevon.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff42546845---19137238722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sathya+veda+pusthakam+malayalam+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 16204 bytes
SHA-256: 8f64c845bde25882752961ac5d4ff1adc737045c830c58c816835fdbe2db4b6c
font_02_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 17060 bytes
SHA-256: 5ab53f42afd2f29008c81af8629a34232127a90ad9e722f948ad640c6c399b48
font_03_sfnt_off0001480d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480D 11204 bytes
SHA-256: 03061b3691757d74fd8b5cf1d738cbf869e0207c7f65077a763af531a13760d7