Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89c341190c81db1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 03:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6423318d9be4c86ebb8760444e373545 SHA-1: 0229e0c5f8cc7fe26c3753fd09fd992c9b95681c SHA-256: d89c341190c81db154d2000ebf8682aa31e0a67fb1788b25c6ef857e898defdd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification of this file as malicious, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=taki+taki+mp4+song+download PDF link annotation
    • https://mobilaide.com/upload/editor/file/nemegisagetuzi.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/kesozof.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/97737023064.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/vuzovevadifafu.pdfIn PDF document text
    • http://dd-eng.com/files/files/zutexebuwojatazitadodugan.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/wozejudimiso.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/60960035011.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/sorexuvovopobubunefokap.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/kuwajuwanirulagugadute.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/senubineme.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/solijokezusa.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210901_493F295A712B8353.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/62271030155.pdfIn PDF document text
    • http://e-district.org/userfiles/file/dolifow.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/xudiridonogukuj.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/24827889675.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/12171274394.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613426d3844d4---82952199718.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/69046681051.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613763f38c2cb---19875141229.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/rixofotinivori.pdfIn PDF document text
    • http://fteq.ru/files/file/tomebonevigijadibalag.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/foxik.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613923016c3b1---motapuwa.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_off0000c825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10720 bytes
SHA-256: fac02be3eafee977963cade88557df2d5098dd7fca23eb188ded198eca21aef1
font_02_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 19316 bytes
SHA-256: 9a9288c30ec1e9e1704a2f9bc40f4e1450f9805bfa5257bea2bd8221ed5925f6

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