Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac15f571ef6d070…

MALICIOUS

PDF

87.0 KB Created: 2021-08-02 23:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9fb135f130bf251ebe86c42c30853c76 SHA-1: 90ea128dd4d4e069eb4db563fc69be56edc62d83 SHA-256: dac15f571ef6d070a3b5f6a9055ba0e20213e9798ab480bffbb54bd8b5e92969
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the presence of these links indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/45228189404.pdf In PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3fde31ad6da96833f4b7908b0b90ca42/61664697111.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0d5fb722eff0db0d4ede0531bec46c2b/42351898117.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/47c72990a3538ec5fc1f85154eb11ce0/5669417559.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8fb73bd91bc94eb8c6d0700259114251/fikegozojorisararid.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072811f773fc---pigeti.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae5aaf22a8---xuxudar.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5acc765f04---finemimi.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/010fc23b664e9674332b12505fb74101/59580488457.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7adb5cc41c3793cae310a34bd7e85b20/buxijoxuvid.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/774c2866336cbf0c4b530060449bc9f5/24689885070.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/40016478518.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/82148137902.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1hg81vt54m41sp8hlhch55rjq0/54094376285.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/kodujitimaferetulitifuno.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b4bfd4a1e27c1d343127baece7c3038b/12756365986.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/26202261002.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/sinupewedo.pdfIn PDF document text
    • https://beliangka.com/contents//files/fomelifepidukebu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c3c42e67d474a4eef0aa925e8032216d/92594348775.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/71855806564.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc918d615a---mafibowegepun.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/nujoxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=twinkle+twinkle+little+star+write+poemPDF 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_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 16808 bytes
SHA-256: 15cdcbcb514cb48be550dd42ebb42e0424550e24afe5b99085419c0c8e6c5e61
font_01_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 10556 bytes
SHA-256: 88a4fccafb6248c40a8cdb66799371d399af47bd8c3ad5698d74a3ffd2d593d4
font_02_sfnt_off0001339d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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