Malicious PDF — malware analysis report

Static analysis result for SHA-256 3435012bfc127ced…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 02:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 656873bed9dfbeb3b35b1b784d713a4f SHA-1: e90f73fb5c8f0084778f1695121dbc04bf966e7e SHA-256: 3435012bfc127ced4181eb6d5022cbca2003a81228547f26396dfd4a016964ea
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall detection indicate the file's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/ketunujegugemepu.pdf In PDF document text
    • http://cuboni.com/uploadfile/hong202107291531459692.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/25278865168.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/paxam.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077881385f14---lazeguwomekisijak.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75841b9d08---jukojarun.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/69974705999.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/v165hdld8vi4djdpatnjlcolmt/98887203975.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/60497442554.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/88825074600.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/somolevasikadixilubogo.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4618600cd6---renitarumiwoxulozo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/goxitoputeke.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cafd09775---suvetil.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/katijidoz.pdfIn PDF document text
    • http://ingore.cn/upload/files/puwodewi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16125491341d32---domorew.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b620ca35ffd---18955665340.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/folutaxunerupodugebimupe.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/95168323642.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210703_005026.pdfIn PDF document text
    • http://keacg.com/upload/files/54760195973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=evaluating+algebraic+expressions+worksheet+for+6th+gradePDF 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_off0000d319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 11636 bytes
SHA-256: 956756f797437c794c9fe36a67e1a0bdeddb88bcda0f37bf4cc4ebe57255218e
font_02_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 17192 bytes
SHA-256: bd912f4d9e1dc68f6cf325b041fd8b301301f3c81f9631e28185c629ce11c056

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