Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f08489635407e70…

MALICIOUS

PDF

77.1 KB Created: 2021-09-01 06:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1146aa44943ba23891eb451c9bf173f8 SHA-1: c4eaddb980389a65812331e52ad6cff7dc2fc70c SHA-256: 4f08489635407e7029cf4390f94e562e7ff92ab3bf31a91d5e66bb88ed2b3942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=systems+of+equations+quiz+answer+key PDF link annotation
    • http://merwepizza.com/upload/file/sezamizaf.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rb8q6os4p085h1aoa45cspmj54/1670363559.pdfIn PDF document text
    • http://marquisdecor.com/userfiles/file/89987818175.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/mixuvezalaj.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/60234913132.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab382ca29cb---tejujubenipujuju.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0e605c9386479d754d7d034c0c669989/dobowenapipapururudu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/14602410693.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///jesibetiti.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/9955680074.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e163a4fa---liwedokovamipivuxop.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6e20dc4f---suxudibogonobumamolizotir.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/82535724587.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160cdce7734325---24896682597.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/ab31b9f55e4f534e2e36e3c2b04762e8/guguzovavavapiwi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f1e321d0---65969896113.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/xuvivipasuzedi.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/mubikikolodonelugovizivif.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/rekak.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ils5g2pfaamtgufjon0a543csu/falopakeluzul.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/62180972277.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/sredh6730ombkr1rsvket3q1jo/36322114825.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/vasapisifulove.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/56841197311.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_off0000c51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 11000 bytes
SHA-256: 10762700a8932bd2d5aaed63e7c41726d515edcf25623b74d987eaf2bb208e7c
font_02_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 17568 bytes
SHA-256: 3630912241d1ec21c5fd9e9daf6703749d2629f062bcceb187d74ec9a2e67b29

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