Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf1aceb2143ac29…

MALICIOUS

PDF

89.0 KB Created: 2021-09-09 23:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9200e1d75f33bfaa3abe86b917b86b7a SHA-1: 2bcd32cdfca6aed6dcfb31a71f0ef8a6d4fac610 SHA-256: aaf1aceb2143ac29523420767dafbc55a8cbc8207700e7fe13aa46ff34760a44
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://fuguchair.com/upfolder/e/files/20210906140155.pdf In PDF document text
    • https://marljivo.hr/UserFiles/files/34766705808.pdfIn PDF document text
    • https://aildf.in/userfiles/file/jurevulufatakukewedi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/dff0aeee08843160032ef36f6008dfa2/roxegisijawuto.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/jekufavalu.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/76316176828.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/givuz.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/50529001889.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/72d3540979ac84575606596237a1e7ae/jolebuwefifavukilodel.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/25522299086.pdfIn PDF document text
    • https://granitnet.hu/editor_up/pirevakozan.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/zojapajafutazalavibebifal.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d6cc05064---23283633306.pdfIn PDF document text
    • http://c-amc.com/upload/files/koded.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/16481218093.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6d6ea2c8---wuzejesopifekeviwolujaki.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/80067239424.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/fojitesurifoza.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/37986302568.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/gilikazikesuxewomapigono.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/viwiwebapujebokigopu.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/vifezufugimodadewemat.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/vigaxidu.pdfIn PDF document text
    • http://apothepharma.com/upload/files/47662335292.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/kimemugip.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/71688723840.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/68174010015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+nine+freedoms+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_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 18452 bytes
SHA-256: ff10640e4efb1c795ec53dff80ad4fe72b90b6b4b64e4498093cf94b39be0aa2
font_01_sfnt_off000126f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F3 10420 bytes
SHA-256: e18740bbc93df0d37723d4b5afdd464c1afb1b578f866aabcbd9eff9cb95fd82
font_02_sfnt_off00013e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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