Malicious PDF — malware analysis report

Static analysis result for SHA-256 29adffb47bf7551a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 06:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37de9c951a2f162843710ba772aa5004 SHA-1: fa9b3402fdd51e9c6762c358489731cc08b8b6b4 SHA-256: 29adffb47bf7551ace9cdba9dae8463e2549b0adcc2f6cedb93b90c3b0cbd9a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external links suggests an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/745ddf7de28a4702f679e2a03f55560f/94029280744.pdf In PDF document text
    • http://monticellotownship.org/userfiles/file/kelokurilomaro.pdfIn PDF document text
    • http://didula.com/img/file/56823847482.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/sededaxapopenog.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202162918167612.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/21654333291.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd96f0986e---67545606699.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/nenofitezemipomewafa.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/febusijatexabimemirame.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/gotetozegamunuvexotabo.pdfIn PDF document text
    • https://peterdegendt.be/file/13640026734.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/kizimovekededise.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01af28ce3---77522492404.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97741773540.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/34065415213.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/73571132926.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/60465515216.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/derog.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/13371894368.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/xajejozizedoniwirofolero.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/83050914511.pdfIn PDF document text
    • http://sushi-belovo.ru/files/72081814607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+answer+for+any+questionPDF 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_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 17184 bytes
SHA-256: cf9c6b97e4540e8c63aa74d4856d57de2c0129e136c6f98dee6f7e83abfc2ec3
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 10780 bytes
SHA-256: 6baa147b4c157f1debb09c1d97ada73070369d956691e3cddbc8a6ecef5747b2
font_02_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1