Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad8fa7449bd72d2…

MALICIOUS

PDF

73.5 KB Created: 2021-09-29 08:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c78656d6b8dd1940f10f669fa1214deb SHA-1: 5cfb621fab5b04a53ba0faa5a1c086f2ccd73964 SHA-256: 9ad8fa7449bd72d234d89ef1100cd376b2ec0c4e11fa218d1245c19a0a0a0d32
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 WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to obfuscate the redirection or initiate further malicious actions, while the link farm aims to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=alchemist+pdf+full PDF link annotation
    • http://bandenplaats.nl/cmsimages/file/37940147309.pdfIn PDF document text
    • https://peterdegendt.be/file/6628803542.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/jidekugowonugin.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mco1up2pqt89678h3ut0u3ia9n/904030897.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf6f49811---rulikegugi.pdfIn PDF document text
    • http://centrons.com/uploaded/file/3657596886139f86b4ead5.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ffc48af3---50837182307.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/bifutu.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/runufinatidadelimovuwa.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/tuvalitusinelawudu.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/vubijagakadedigedututega.pdfIn PDF document text
    • https://ratosatu.com/contents/files/33766571927.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/8990865657.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904163838178107.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091517492885.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/xutafuxozerifufufitupuf.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/23196430646.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75a002d59096db93d891cf1897bfc6e6/tilubumasudukebewugat.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/libajurawixo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132feace3caf---74693733806.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/39171374028.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/57002692286.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_off0000baad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAD 18032 bytes
SHA-256: 16d9e17246b3b5f3358b6e07ba6a22338bd3035abc53b96be60795942781a8cc
font_01_sfnt_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 10480 bytes
SHA-256: 6ae7997dac5eadc2ca5bf1ddf052392be71815593723043966991b7916369ced

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