Malicious PDF — malware analysis report

Static analysis result for SHA-256 e515b50ab932ffd4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 00:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b65c22405b505ae3e1660596b981ec54 SHA-1: 91b46a5ee442f7e9fc5ef153d5d584d7d2c4730a SHA-256: e515b50ab932ffd4816b15675784f9d450a8340e361847744a175cfa7ef2a268
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=poco+x3+nfc+ufs PDF link annotation
    • http://rw-hse-businessconsulting.de/userfiles/file/fizipejirexibo.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///28684362527.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/wobufaxasiratawego.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/287bfa7312a5c47f99638be0e66ab04a/81944181780.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210906_222627.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/16925588855.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd090d8a8---88462319030.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/13584390538.pdfIn PDF document text
    • http://ccshecea.org/upload/files/lemotefifadapavivipozeno.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tinapevaketa.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/59777248500.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/zelefumixofivit.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161321dd94713c---bonoduzopufevoriradapexi.pdfIn PDF document text
    • https://svltv.in/userfiles/files/27274814544.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/lufuxusafezogodal.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/xafemibimo.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/visawa.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/77393923545.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/bazefomulux.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/wuxidemonibusamoni.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/54ca1043374ccb98642f7df34662c091/kabuvevupobowunimivexil.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/repemazog.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/3278090870.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/7576645586.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/zavuluzubisurup.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/kumozadig.pdfIn PDF document text
    • 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_off0000b5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 15940 bytes
SHA-256: 35a7244d920f59f63cc89cb06f22ce32a230117573229222061bf91a599d2216
font_02_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 10072 bytes
SHA-256: d6b55ce609755617f1062fb100fa2110e9c6e710d9e95fa583a70f0ca447adef

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