Malicious PDF — malware analysis report

Static analysis result for SHA-256 e036f4e1c1cb8ed5…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 06:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f2c4b03644a1334df825fc3842b35bd SHA-1: 7e3b65bc31b09a4e5f95895d8cd44ae1a4bcc138 SHA-256: e036f4e1c1cb8ed58606b026de3439848e56eeb70dd5d8773e0d727c9909902c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5d8ac270b---59428908075.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/q87d0d4qn0kfbh3l7ova8gbi35/97208989580.pdf
    • http://grandrosso.com/js/upload/files/tobexelojoguno.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a75bd5aff1f0698e19d549763c0e1b32/53082861954.pdf
    • http://banghetretruc.com/media/ftp/file/70775081283.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160747e97ec77b---jumuvutejevadomofepef.pdf
    • https://imagebeaute.fr/userfiles/file/79569958033.pdf
    • https://contabil-fiscal.ro/mm/file/59621934913.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/19184183178.pdf
    • http://fmi.lu/userfiles/files/duvuzewenagekisepirumevi.pdf
    • http://knshzj.com/CKEdit/upload/files/25058604088.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/49a58edeab516fb1c1372a1ed6f87d4f/dizoperefavimew.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ccdde18c0---11386805285.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ruxuvivi.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/13873296931.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c46514d23---wamipudo.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guguxasopevujexoburijin.pdf
    • http://drivingschool-brno.eu/files/28104803594.pdf
    • http://enjoy.sk/editor_uploads/system/files/59441625403.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/84395fbd5aa0eeef8a2bbf3530c2f188/95598247211.pdf
    • http://daindnc.com/fckeditor/userfiles/file/jatimoludipuvugalokado.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2dd4911a9---judep.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/21r32vgfgdei80op06p9dgtlj3/soruwekatobowarir.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f87e8b247---kuvoxatokixewuvori.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=female+names+meaning+star
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f457.bin
38535349827714726376aa252f3d89fe74440d7874d65ea71193dbc602e75222
pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 17828 bytes
font_01_sfnt_off0001227b.bin
8611794291e9faeada9d25c579d338d33039dfc1180308e9692fb164fdac7ea1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 10308 bytes
font_02_sfnt_off000139a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139A0 16792 bytes