Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec30ad797244d51…

MALICIOUS

PDF

76.3 KB Created: 2021-09-21 16:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 166604831adfa99f9c043e7782fc5fae SHA-1: ffdb26e1d411b173306976a7652dc15df1573878 SHA-256: eec30ad797244d518a88dae081e59a0a0a51561b89d9723629415843d899b1fc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be redirecting users to potentially harmful content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://forumcutuca.com/ckfinder/userfiles/files/35746193305.pdf In PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/4598378992.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/mipevupobefudozeputulus.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/rapime.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/72646215476.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/42553539484.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/tixoguxasenakilog.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd73fd0fdb---gokakewizujaneliseke.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb67d745b---sikasitekomanujanonurukus.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/nk68m3e9tmajfhvvfe3li6cgv0/kibepalukigatosoxesuxivas.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mirarafovoto.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/93601825325.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/58964136755.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/19207234355.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/xasubef.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/21796891628.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140622a94bdd---tuzam.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/girupoputerilo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a8a11ebb2---sovagulegimijege.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/99073811071.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/447da8a0b1cc8241ab9655efc881669f/davijozosa.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/65361121828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kick+the+buddy+unlimited+gamePDF 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_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 10868 bytes
SHA-256: 39433098c2b87ceebb76dc3966b31506ec400f3b45605287464f61f4886e3856
font_01_sfnt_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 16412 bytes
SHA-256: 20a66619de33defd66347644bb6708c066d2627ac49e3ab56ddbe12e4d56fbf7

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