Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2c21de65ca0629…

MALICIOUS

PDF

82.9 KB Created: 2021-08-23 09:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b41d0e07be807f4faa6af6c4aa496932 SHA-1: 081f86edaf71b4f01e0538fc3a1b437375da5c6e SHA-256: 8c2c21de65ca06299e1c5debd26ff3bfecb0d86d6c1b88ff59996c6ccb20a63d
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely attempts to trick the user into installing a malicious browser extension or update. While no scripts were directly extracted, the presence of numerous links to potentially compromised WordPress upload directories suggests a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mtecommerce.it/public/news/file/37423689954.pdf In PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/97392051455.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hl8ad13skbuvhgqjrg13dqio7m/wulisasi.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/50b157690b7aef94a9d6c0b94087f126/31616462801.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ebig2gm12er879fd8gfca3md25/13254406163.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021520447545782.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077543dc4b3f---52240392205.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084dcf7a131e---26833994711.pdfIn PDF document text
    • http://rurisnet.org/images/file/sawemuwikuvameb.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/juneni.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/225cea27d28fe0718543a6035e9c50d6/torinakeza.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1513d8896---fivekinepivibunebonaza.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/fujekovofe.pdfIn PDF document text
    • http://gyobel.it/public/file/loxalirofufaguluw.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b091eb2f08b8bf3f50df366cf9803f0c/5197991106.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1ba3e3f27bd6eaecaff888490a3fa8a6/10843914337.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607211acd3865---mijobulexebed.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/tatuvuzogasozubepudotupet.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cv4ojiko0c4ep0n9a0ie8cgcfp/48731236704.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eac5c89606538ae335e3fb631e172e8c/11144779893.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/63904403417.pdfIn PDF document text
    • https://hgb.se/filer/file/dugobumi.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/lumeguwakutugure.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/36937590281.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/68255329733.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/gumedozij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=44000+kb+to+mbPDF 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_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 9800 bytes
SHA-256: 5f3cf632ec7f606748108da8c6c24f8d0c88c39e8bd6921b7e9c03c4c0ca56be
font_01_sfnt_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 17020 bytes
SHA-256: 663a99a0f316858c5f621258eb86d328215fe550e875ce2d7b09ecbeacb2aa73
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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