Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61ad9201c468509…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 05:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46675fcf0bbd1f184d2352be1d738cae SHA-1: 604faa881ab27d32651683d722846622c534f52c SHA-256: d61ad9201c468509c2c797cad32cdb5aa2ec256ad90debe7a5dac228209ed01d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM points to links on compromised CMS uploads. No scripts were extracted, but the overall structure and heuristics strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2d98655aa35c97bd1d2f9fa3dd7e509d/rajitovepivasemanuxo.pdf In PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/welogufafadofidati.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/sekenoweku.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/xemesizezuxodusogiw.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/69102535007.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/tifali.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/27514988330.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/92162308753.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/xivariruvaxava.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9281c110---87700631155.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/woboloxinoduvew.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/budomuzidupi.pdfIn PDF document text
    • http://schokozentrale.de/idata/36413544124.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/djhmf6b1m9qbrejrdupca1hopg/76840879848.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5c329324---59343847690.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/84490644917.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/tijapowotuzububaxaji.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/58255624225.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902162737693.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345a243f052---munakuxid.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/42636224165.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vtldm70b4sjagf7d8qrr9mhjge/disalalejalupaxuro.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/72582965202.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13081110432.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/17319656536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=night+sky+android+wallpaperPDF 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_off0000c1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A4 10940 bytes
SHA-256: a92bffbec95f162e0ea62ec819e7cb8c3a3616ecfff4eb6827ddfef1018ef5f7
font_01_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 20192 bytes
SHA-256: 8844668454b0b9f21141304713348d45af3b3cc40c56af5c8d960fca3439ad28

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