Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b635f047e52e76…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 16:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02edbd9e8246e453bff8ad4ea6a0947d SHA-1: c2029e781b80bd07cc9f120408a557b273c3eff7 SHA-256: f6b635f047e52e76b685c4c053887039dcd205d5ab71246b5f8b524d5efc47ed
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The embedded URLs, such as http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e8a1f2591091c9a1733c9cacf7e42e33/bodexiwi.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://siriusdynamics.com/assets/uploads/files/rokotiboro.pdf In PDF document text
    • http://52963566.com/upload/file/202109101649310138.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e8a1f2591091c9a1733c9cacf7e42e33/bodexiwi.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/4952994895.pdfIn PDF document text
    • http://ktcz.eu/files/files/14326421821.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/dileliriwenewezob.pdfIn PDF document text
    • http://sergeybazarov.ru/file/80672776446.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/zegobapizusa.pdfIn PDF document text
    • http://a899.net/userfiles/file/suzuvaz.pdfIn PDF document text
    • https://ubranni.com/uploader/files/9763252080.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/39178031031.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/zotupetusajusutis.pdfIn PDF document text
    • http://delve-cr.com/uploads/donizuwipesiselunem.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/wafag.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6c7e64cf3eaa65312eed30c2634addd0/92323131556.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/dikufu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd178dec3---43515386433.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/80312513474.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9c287d3fb6716f8656c46d9e1fe27847/52253703041.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/sefatupori.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/12716839208.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/rikabodatukiroku.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630612684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+free+facebook+app+for+android+tabletPDF 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_off0000b6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A6 16920 bytes
SHA-256: c05a758e7c0fc0b65287097485fc9c36ab68ebe400d20748cd9a70f727b82a62
font_01_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 10764 bytes
SHA-256: 01e2b84d1f9152f3f7fb820dd6ef0b2ebb7313c53e30d57fb3b7d058c49019b1