Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2b491318c82711…

MALICIOUS

PDF

77.5 KB Created: 2021-05-10 07:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79a57503a1402964fedb71551b8580a8 SHA-1: aa3d3797fb83911214d966ac5d3d4b80fd9b5565 SHA-256: 0b2b491318c827119ba8092226d0ef8c8f355705b97b2266bd63a65303db9bbf
156 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to educational content, specifically a worksheet.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/575mnghkrtm31ko0uijkjv9jr6/88180749055.pdf
    • https://uleiuri.ro/userfiles/file/tofapulivorigusegu.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071702f3f95b---wuguladol.pdf
    • https://stopserv.ru/files/file/bugidoles.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be2bf0ffd---67288932068.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5t35j3kb24l2tpgi9bsqhu097q/vobugumerajupule.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/73336db78bed23fce0135e558f29bede/24592265413.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7a6fb793346b3c98c8a4d878f67a0f50/ludomamofavafiwogoduvuk.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ic34jfj0n0j6l41kcrd90mgdr5/lemosugafalatizoxabuwita.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d663caa0---koseludowaze.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c5a023e0732773aa16d9699c0e0261d5/36555595501.pdf
    • http://extracam.es/app/webroot/arxius/file/xujevokugelamalifa.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/43993487fedfa06117da96986e857fe3/26100851452.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a726hhucg0j9kedl9poj33m4e1/57177399292.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0qdvud774b6fgbalfcihkj15h3/fapilunogonakobo.pdf
    • http://asbufestival.com/uploads/FCK_files/file/67116623362.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=adding+and+subtracting+fractions+common+denominator+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef54.bin
cfffc01e2c6ad018cc1faede15041ca673a223bbee20a3939aadd84f8636ee74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 5688 bytes
font_01_sfnt_off00010299.bin
a281fe7b437f0b2635c4fcc067eef8702b5b5ac0cca7c7d97151873110d57586		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 10516 bytes

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