Malicious PDF — malware analysis report

Static analysis result for SHA-256 33626d0d58b60567…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 01:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b5e2bea6ddcdb681ef991a1f87b2c483 SHA-1: 98e9f50d545dc7c4ccd5be9e3fb13b41002f22b8 SHA-256: 33626d0d58b60567325f480449d1e86c0db115ef112822015996f885e1d248de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning model. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories. The primary attack pattern appears to be a link farm designed to redirect users to potentially malicious content, possibly for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=the+movie+demon+slayer+mugen+train PDF link annotation
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb16429cb0---52528997288.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136a05a563fc---duravamaxiralupoletesuna.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/71676933657.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/87902103379.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/97758092529.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/82438400710.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/64405868975.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/matuniburedi.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/dofalozukerosobesu.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210908154634_1439924160.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130021851dcb---kuriboboreboxinekitu.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/lixokemolow.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/95023901219.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/luvafarolozex.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109031201261905.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/21675821762.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/81197011766.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/vejovideresasoxi.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/93875862671.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/3647327625.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/vuvukana.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613de302b7fd8---kolajapijowumonowog.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9c0cf5085e15db43a4d496f2f52d7ef8/tafeweva.pdfIn PDF document text
    • 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_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 22244 bytes
SHA-256: 53592ccfe364332be5b40e3634c4e8239953ded5e5bb2bd54c36dfca931c168d
font_01_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 10936 bytes
SHA-256: f00f4f14f82e16619482b0ed22db0b4b52a02402234d5e77088f3ef09bdb8ec9
font_02_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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