Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93e34667a097285…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 09:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 427450f8aceab50090ed51dfe70d6fad SHA-1: 0872e503cffbf2ef2b91cb7b7597cb62b4504f8a SHA-256: f93e34667a09728520ef67cacd7bafae361f4606121df918621b907b39bc49eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to obscure the ultimate destination of malicious redirects. The presence of these elements indicates a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://bk-plus.at/userfiles/files/82992044104.pdf In PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613338e1b5f3a---45900066031.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/velofiniwuzeliwoji.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bda91946a---21644547209.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/vejefepizowujur.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/6418424083.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/13304023005.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/57540431460.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d39893c6b---radodutosirabor.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/74126226343.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/87448492210.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161386b730de04---penagifor.pdfIn PDF document text
    • http://dfanchem.com/upload/files/67191724768.pdfIn PDF document text
    • https://seikai.jp/free_images/files/64159158769.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/6955313785.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161308fdd054e0---rujunidojog.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/vijonetiwunaja.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/lokadafavika.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/mugunilexo.pdfIn PDF document text
    • https://ikansambel.com/contents/files/90313614869.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/bubewaxopolat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+delete+firestick+appsPDF 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_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 17792 bytes
SHA-256: acdd958415b919dd89324ca0ae6313d98c351637800cac6ec50d0ca8c73b6637
font_01_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 10676 bytes
SHA-256: b2de8b778ff2505d92cd73fcc600ffd45e93088fd0d1ebc7e5e98f1ee8897a65

Open this report in the interactive analyzer, or submit your own file for analysis.