Malicious PDF — malware analysis report

Static analysis result for SHA-256 331c7dcf3731e036…

MALICIOUS

PDF

71.3 KB Created: 2021-09-15 10:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9c61bbf74f360d5545beb98369d4537 SHA-1: 83a7a83daeae3b41c65d0bcc4c2a08a887076a60 SHA-256: 331c7dcf3731e036850621da21e235d58232dbc12390c4ef57eb17c2a6721965
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. These heuristics, combined with ClamAV detection and ML classification, strongly indicate a malicious intent to redirect users to potentially harmful websites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=download+construction+games+for+android PDF link annotation
    • https://gtnet-engine.com/ckfinder/userfiles/files/ledarogepewujosemin.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/wufisekukelut.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/66864415235.pdfIn PDF document text
    • http://artio.pl/files/files/mopifofoxijelumurago.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/lozaxof.pdfIn PDF document text
    • http://dytac.hk/userfiles/nikusofafefudosegunixivad.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/52317294565.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/zitumikofiposezizegex.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161387607cc4d7---57645923530.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/nevarosenabomasonalamo.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/gapekutose.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109040953349000.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a867698aca---vekowo.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/vilefapunepiwemekot.pdfIn PDF document text
    • https://sitarasign.ir/data/file/rirup.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/53765758296.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109020537368202.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/68029149801.pdfIn PDF document text
    • http://amdind.com/userfiles/file/kebajoxowojumorexisasor.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/26965718547.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614128c86cd72---jejobutagodukekelozoromi.pdfIn PDF document text
    • https://ms2oke.com/contents/files/fakekiget.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/93863870975.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/27788696301.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/65875540412.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_off0000b752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB752 11004 bytes
SHA-256: 0e549c2e7d84d2a438fd164c24aa60d86af6457bfb318fa2c0172d00166f9e33
font_01_sfnt_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 15184 bytes
SHA-256: 79dc1ffaf8e8d99b929e5c9c6b033de4d3871e122eb6445cde3eedfed82d1444

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