Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3c3cd825b61202…

MALICIOUS

PDF

131.1 KB Created: 2021-08-07 07:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09f5145485af7f387d7c2b4aed434df9 SHA-1: 219251c2883e38014ea9866527696477dd4e36da SHA-256: 8b3c3cd825b612027df1815e947786ce6298eaaddb9674111d714ef700b9cd5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and link farm indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0312c1a9d---rijopodevaposig.pdf In PDF document text
    • https://aadharshilaschool.org/userfiles/file/17157704903.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c937fa2ddc---94219119334.pdfIn PDF document text
    • https://camelcarpet.org/d/files/78894876279.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/15683216639.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/26917718080.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be8358a459e---3060606111.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/lomabimuzewesuguwepabona.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee29b22ddd---sozuwirorezunofekoregenif.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776bf7d191a---laxadilak.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/3707540922.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a037d8abbca---doxijaredozufikoseg.pdfIn PDF document text
    • https://kede.org/userfiles/file/3395692871.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/lapil.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608129e0bc6b2---mijewipipeziludonegimarun.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vsufmvfs6c19j90m0db384kb82/zoturaxapu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ce8a8a72efcae6b11bf6a9ada6c84bf3/24545673854.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf436a552fb---leran.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/fexozamifexuninuzelase.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/40224972592.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28da0424a---28879721109.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/tatewuwudezilizi.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608080cea5fae---garan.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4af4450da---fafeligu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bertolt+brecht+peque%C3%B1o+organon+para+el+teatro+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_off00019bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BEC 18216 bytes
SHA-256: f26e019caa40b933414d23957202f91bc0fc091fa667f2f1e80158bc33f8fd23
font_01_sfnt_off0001c9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9C1 11284 bytes
SHA-256: 96a29eeb90bc4ec0fb8ae5fbb736b3e5516c35fd3574f89f5b6e1d850104c321
font_02_sfnt_off0001e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1