Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cdc14d250ed2d9…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 04:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e7d8ca07823007c97a8f2774e677f65 SHA-1: e6e9fe2735bf67f7971b2e85d1db2f6510831a76 SHA-256: 04cdc14d250ed2d9a08681ad73eb49f9e6a2914fd7835499ae5fb43300689d3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://fablab808.com/nbloom/fckuploads/file/69792919498.pdf In PDF document text
    • http://silesiacapital.eu/data/file/96459125524.pdfIn PDF document text
    • https://yuss.it/file/84998258932.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/82834356761.pdfIn PDF document text
    • http://otczenacts.com/media/files/dalagelasazarakuto.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/jaziliwewi.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f6aa89e54d4ae93b70b1da3ebe6bbb17/negujuwevawogaz.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61517262518.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/15522588947.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/srge7u3evhbqdslcjktmnaepgf/zobugefikewewofu.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/fiwakomefu.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/69565138149.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/xolesuke.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/walepikipemo.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dua0llh7euu6logh0ooov0oobv/49956159695.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/jawiwi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f0a79744---pugezuwagokabenofakosalo.pdfIn PDF document text
    • http://ccsl.asia/files/lagujojegidided.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/pafus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e959047f474---12225956502.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/xozatofeji.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772e82ae12f---94843097167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=give+me+liberty+5th+edition+volume+1+pdf+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 11324 bytes
SHA-256: 0d6107d6176a967aed07cb6016bc394197f9659b3ab9e18e8d8861b3b0465fcb
font_02_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 17780 bytes
SHA-256: 833023b1d386874b1cbcf0d1e8634ee801f089402dd5122b453b7ebc88adeaea