Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0912b38dd0140f5…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 11:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 854528e7f66c6dadb7ff443162de8400 SHA-1: 4f62e6b31a94de726576790aa76a6b0f1b736022 SHA-256: b0912b38dd0140f5fb62dccedec46585b3b5fcaa1bcff2fc48ce23aa0b9daa7a
144 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, many of which point to compromised websites or link farms. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick the user into installing a fake browser extension or update. This suggests the primary goal is to compromise the user's system through social engineering, likely leading to malware installation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crysiq.ru/uplcv?utm_term=fortnite+free+skins+code PDF link annotation
    • http://simp-q.ru/userfiles/file/gegubevitirujidufuroxev.pdfIn PDF document text
    • http://iphysiology.ru/upload/91531880324.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/cb2cdjcejm6endmkosb7ulu0v1/somuwufinapokegudogidu.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/51562559642.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/12809368529.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/65836862851.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/popaben.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/44627598189.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/68687247875.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/famavulaj.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k1sguu2rtuv0u9sfpsdusbb5jh/73676254811.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109130201287716.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/82002822828.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/kavudakaxovu.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/ribuxobolaku.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/gitepowofuwivalo.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/44009497051.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/44898881583.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/kugarafekagixeki.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/82650753281.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/13253181286.pdfIn PDF document text
    • http://shopabrang.com/images/files/setuwewukuro.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/83623428784.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161333676a9e0e---kufow.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_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 17916 bytes
SHA-256: ab718fd7df5b5b594fa50fb6b3a1a1cf57377a8b0a733037a90f5dc2122573fe
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 10332 bytes
SHA-256: c78bcfe522c4c8f7b0ba52fabf7ef4d50bf7eeb31e867c2ab78bb6d351b95da0

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