Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab02a1f305d70577…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 00:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8ea85a5ddefa27ada26f5bef1f486ce SHA-1: a3abcb319a0cc8065b20079118a89caa355e62dd SHA-256: ab02a1f305d705777739f6feb6ad7196e0118bf179f144c10e66d55e15cf8d89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rt-totaalafbouw.nl/userfiles/file/99682516186.pdf In PDF document text
    • http://olympicburger1988.com/uploads/files/fijirebifozirulidowozifu.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/32997199589.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/16418837618.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca30a1259e---lojomuxewefe.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/kobinejosebe.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/ferisukijezubogilijuvu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1a7d9e32---85875073954.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/24046578598.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f627c71036---76095613700.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/nenunolax.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/7134768033.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/rubapuwodo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc78cbe93---16451698304.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/rc2htbldjnem17q4229svvni7l/92504563485.pdfIn PDF document text
    • https://ocw.tw/uploads/files/gogumipumijowi.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/47999565250.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322763964cb---zirep.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16132edf07c6b7---73366573284.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/wofugamiritomov.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/9bf58ef64d1d9d6adeba7e5b21b234db/fexexikafi.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/kibupazetuxedavikakirow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=chrome+save+image+as+shortcutPDF 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_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 10724 bytes
SHA-256: 0b1f61506d28eafe237859ce81b4ff9c74a1e76be7fc6b9b938b954fb51d6c9c
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 17340 bytes
SHA-256: e101ea45145a8f8be50a3466d02774c68df2a7a9c377650ad98e8e8c467f2993
font_02_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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