Malicious PDF — malware analysis report

Static analysis result for SHA-256 27356ca2f8adcaf5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 11:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4a5d6465cf827ee20ea8073bc4ea688 SHA-1: b2e8b5ecc22e6da91b9be136c7d1f3c76fd4545e SHA-256: 27356ca2f8adcaf5cd173f2fbdf160343a9375ea4e4f7f5062e8103fdd2fba17
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. The heuristics indicate a lure for payment redirection or browser extension installation, a common tactic for phishing and malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f7b097e0---dujew.pdf In PDF document text
    • https://lecachet.fr/docs/files/sifutaratobepugurosokozo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613887b90fbbd---bikolozelojowav.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/gutem.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7c04afan245d3a7mih154vjq04/28061238752.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/52826924783.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/98413285142.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/92195056974.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/vifuzokowuwavosem.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0bd0c77bb---93548636217.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/pojirawotimetoxesewu.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/68090952065.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/juwuw.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5ug2ftu1p64sngu6jp5g767aus/buguweruvax.pdfIn PDF document text
    • http://ud2-140.com/files/98123922511.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11d9f395e---nizinewusevezikuno.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/21521069322.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/jigazeninarodivadewo.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/39222882790.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sivibexogedoxuruto.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/62789700574.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/20486132931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=watched+multimedia+browser+appPDF 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_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 17332 bytes
SHA-256: 02ed284a5844b774902475a4371a636d1247fc8af24981faa1d2d864612e936a
font_01_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 10992 bytes
SHA-256: f71f7269e10da5005013792448fe5ad39e86c56e0dbe840ef465178817c199bb
font_02_sfnt_off00012965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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