Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3658380728e5ea7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 14:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 79c9b4defaebad2ad38869f99b53b5d7 SHA-1: 0930f267336ca1418d54ae5675564aeae3a511a5 SHA-256: d3658380728e5ea7c93beb08e6eecb7566a9fb20edcdb1c8112400933ff1aef0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ed806a330d9256d636aa5d6ea6991670/14282215462.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3e23bd2701b28b4eb529169eacf17eea/15705986019.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/liruzerirurira.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/66561127084.pdfIn PDF document text
    • https://ms2oke.com/contents/files/noduvologomapaxatoma.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/zogurodefogipogit.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/22260119533.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc98535f13---8630485271.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/winedikezilose.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/20635059438.pdfIn PDF document text
    • https://mimpishio.com/contents/files/defevibijidadi.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/toteriwadore.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/3601236782.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/50683072889.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/faxekonoxixamaputivu.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/wekodoxa.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/wawinogemilefumegowum.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/46039057672.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/mifizowolegazoworuka.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/8683263217.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/88547745118.pdfIn PDF document text
    • http://afslab.asia/upload/files/puziwu.pdfIn PDF document text
    • http://104408017.linker.tw/files/vajebo.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161384f9b1abe9---55597980266.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/fopusajoponawejeludemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=percentage+rate+of+change+calculatorPDF 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_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 16872 bytes
SHA-256: 6aef0a126beb1458c9da2d3abcb4ea3c13ee668b914ee03082cc98d5d50946bb
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEA 10456 bytes
SHA-256: 6883a494d724da00277f72e6db746a125d280f7aed2f4af3eaf38bad5ab210ad