Malicious PDF — malware analysis report

Static analysis result for SHA-256 0929bcf85cf6881a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 05:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 81535c09cc941219a5b4f0d5c6978b5e SHA-1: 1482405efb51c90fe135562551e62fc1e47b2e87 SHA-256: 0929bcf85cf6881a7d9abc14207c97e24181e0b36cfafc92605f9dfaee04e85a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lakesnwoodskerala.com/uploads/file/62517664203.pdf In PDF document text
    • http://mitcostruttori.it/userfiles/files/3548928988.pdfIn PDF document text
    • http://koutingchina.com/upload/files/lakalirusefule.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613648b56401e---58083618253.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/6818005281.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/dulefopol.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/tafasefivuvexiv.pdfIn PDF document text
    • http://master-br.ru/img/file/raxunoniwifubafikobemir.pdfIn PDF document text
    • https://ocw.tw/uploads/files/megurabasuzoxiba.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0ca4kh5v6n26mrdrhthgh23ndj/gegugolomuzakizevuzuneluw.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/56befa963c8a2e4da6ed3f8317fb4010/lokabasidexopijalap.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///11226751837.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/xoxeponimewi.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/tejitokura.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/29351227712.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/gekitib.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/47265689342.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/fofimofofolituxuladiral.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/papozisetajone.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/93295026420.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161329dced955a---94425144835.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9312c272ace79209dbd8ec2d90554865/61335237738.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630909081_1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+see+stored+passwordsPDF 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_off0000cc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 17836 bytes
SHA-256: b30358192caf469b45d1a6872c018ec1b8ef7c5064a4eed8de081c1ae8bf5f81
font_01_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 10408 bytes
SHA-256: c60862869fcff83eb80fdeefd4793384b32e2d6bc33183c7125f0f1dc7b960f5
font_02_sfnt_off00011245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1