Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b7d3edea7cbe4c…

MALICIOUS

PDF

84.7 KB Created: 2021-08-01 14:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ef55e7d60f3d845419ff1d1a64c7d8d SHA-1: 99941eaf8d82dba9821bac7c1621aca04b3f6d9d SHA-256: 99b7d3edea7cbe4cb3887f805896152987b89fee16de21cc6dcfce0eb43b6adf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The embedded URLs and the nature of the heuristics suggest an attempt to distribute malware or conduct phishing attacks.

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 http://dzbnf.com/upload/file///89397464908.pdf In PDF document text
    • http://learnazia.com/fck/imagesfile/95503651937.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/fuwijovibavupepivido.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/61071667767.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16086ebd07bddc---30893043378.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fipabasojogoradawute.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609717b42ded4---80881704468.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfccb8b5fa0---95933644277.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/fupobegaxopoj.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081fca105662---27643196763.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/k0tjptg44j245d8gkhpvbnck44/65631552969.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/03o14mgidr069ub1adh531bnpq/31806358378.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/xowolek.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/80649258848.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/0cda984c9239fbb7a83dadb86a7fcee5/ludukimi.pdfIn PDF document text
    • http://myphamasia.net/upload/files/17907735715.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pjhelndkrut0h4jc8ennjv7os7/witurupinakux.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/46cab50ebb2ad703a7c26d75b00e1246/suzokas.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/30738943135.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773900aab2d---72208440478.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/tafuxapufuwukekozi.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/43676104055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+reveal+page+breaks+in+wordPDF 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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 16632 bytes
SHA-256: 6a41d1bc43bd7167bd00041bf30e8d7e2183bda08187cdb329c67f5bfa0c1176
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 10940 bytes
SHA-256: 5d71492cac094dfdad0061e2ad08d3bee54ff576e6051d36e3984b25b057026d
font_02_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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