Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20172fbdb26c1d2…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 12:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ec3404ac2d304e02ced12001181337e SHA-1: 8bea2233cf15aad521bab5a046b4d5b5ca320a9f SHA-256: c20172fbdb26c1d241999aea9d5a3b0aa6fb912cb2d9628867ff7ad3e5804267
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the final destination by using multiple domains and UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ikhmongol.mn/ckfinder/userfiles/files/rovanirego.pdf In PDF document text
    • http://epmachine.ru/d/files/25479474785.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/20008789362.pdfIn PDF document text
    • https://tonitomov.com/picture/file/89167596561.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/76493465936.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139137bd88af---7675054691.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/07cc4b3c392cd86541a0021297432265/65563389211.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/xiwiduwotipegaxunusaliju.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/822213761.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/kakewox.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/77574870783.pdfIn PDF document text
    • https://halead.com/uploadfile/1631413826.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614aefa1acea0---29576548690.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/vejefalerazabejekurosupaf.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/tatod.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/kujakosizizowo.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/71446737318.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613281644b6f0---22941296921.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210915153427_80twbz.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/xonagolamom.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/69346606695.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/31365271876.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/sefupodizalatiku.pdfIn PDF document text
    • https://anpheatingandac.net/nbloom/fckuploads/file/remigirasadexobevexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=barron%27s+sat+physics+pdfPDF link annotation
    • 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_off0000b2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A0 17376 bytes
SHA-256: f854b19a013fd3607c79c99cf731f4313361300cbbf425f96f839525b1a848c5
font_01_sfnt_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 10740 bytes
SHA-256: ee93cf4169752f24e032d566c28ba7846b290dd9bb8a827c1d96ae353b38ed3c
font_02_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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