Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e9ea3835cb3576…

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 10:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19a1f194bfa9190535ac278e24c4ee48 SHA-1: df9795baa83e1d02faf2f1931e51a206d810acb4 SHA-256: 90e9ea3835cb3576b7b6c396dabeb742d5ed555cc914461332a1331d0656019b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting domains. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=one+hundred+eighty+eight PDF link annotation
    • http://valsadindustries.com/userfiles/file/vonawe.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f1aade8452c0987d3425bb5b524dcaff/53300139476.pdfIn PDF document text
    • http://liyangah.com/Upload/file/46227303754.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/55432830764.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16091c3cbc0f6c---xuxunamoxokawowiki.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a5b4770f---57660278736.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/205588428860cfe55a3376f.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zupupukinabugifaj.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/36918938622.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19ba8bcf3---vobipudajimuneforolepun.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/12p8hi38headb2osjo34sdl885/navupezij.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/18444024036.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/rutufezufojuduxorafiburek.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3eb431ce0310bda22d9554658566dc5b/volalosoburavalilarux.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bc8669f239385ecd0dbc418eb7e6a153/28148015416.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bmju47eb06b5974isseaitcal2/xinifejimafufajogoj.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707b689f16e---16141875091.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/85257586244.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/30206346878.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ece203c77256cbbfbe309fa95d72f573/kofosekadagagujikomur.pdfIn PDF document text
    • http://nature-revive.org/files/file/nigawewipitipirevilulida.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/c7hph6gi5dftoov78cu34cc5h5/katakatej.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_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 10268 bytes
SHA-256: 25c777fd51addbd78d59dd212691548303135ee821cda9b7145a1f1649dbfa02
font_01_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 19648 bytes
SHA-256: fa7e7875d6b2a6df099608e39a946f8d45b04fa59ddc4e233770c6a74f767892
font_02_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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