Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a12da6e6c2f528…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 05:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d32bbe9211832cfa16d6082cea09e1a1 SHA-1: 6ba0955d60f3b48034bbd144eafc92083fbd8813 SHA-256: d6a12da6e6c2f528fcf900863a161834eff09867d9dc5921ceed2f419fd066d2
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/87940aa8b252af80a10d15187a7a1b07/finadudos.pdf In PDF document text
    • http://pillshop.ru/uimg/files/salekesorumuzigapepalix.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/kuxubo.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/dabekafigilavajutujat.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/68769319164.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/jugasik.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/75690135338.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614fcafac97bb---zebero.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1d8526b6---77988719724.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/39684353375.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/zokesokasagitoz.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/zapefidaponavu.pdfIn PDF document text
    • http://ave-france.com/pics/files/22908934117.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e812d35e2---vuvalodoges.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/98649871860.pdfIn PDF document text
    • http://vina2002.com/uploads/files/fepokinatopimagukogof.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b6c056b553d895a797f7b42d7d85d3fc/90955634724.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/bisajudefexowe.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/8848404839.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/99041495849.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614128452e08a---90620387258.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/dopfsil4t31ft7pem49dqogda4/kigikezewagil.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/widejetuk.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/93129225210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+unlock+a+broken+screen+phonePDF 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_off0000b493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 10788 bytes
SHA-256: 122e1e63b9d9b4b67f1330478f571d9a5d888b4aac2773e93fa87a0fc978ac93
font_02_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 15564 bytes
SHA-256: d057a7b5ca96b4162ff86d096d2e53c3923c8262a4fec80bca5f19285fc6ad38

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