Malicious PDF — malware analysis report

Static analysis result for SHA-256 01991308bf367d1f…

MALICIOUS

PDF

74.7 KB Created: 2021-10-11 17:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 354322cec8e9b6b227d9e98b039cf428 SHA-1: 8de6bec751c17d7b2c4b52915a581a51d16d2964 SHA-256: 01991308bf367d1fa0a05ca92864d1ad7fa6f6dc91f08c937704d2c22938ecb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=giardia+in+puppy+poop PDF link annotation
    • https://birudongker.com/contents/files/3200453398.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/71899831484.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/raruxutogaraku.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/2076351598.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/gebefunukufutupadamajatiz.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/nunezi.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/jilalufamobip.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/wadov.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614961a06a1d7---posewar.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/44535567446.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8rl4ccuckrmiuni11j2q2mvl4/89882432272.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/72256790681.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/mozolakabesone.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/99526436749.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/29644292085.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/sobinatatimibemibexujo.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xonon.pdfIn PDF document text
    • http://teraval.cz/res/file/ragiriwirulugugesesuso.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e640b22a0---mobasesunisilalalofotesi.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/30272882890.pdfIn PDF document text
    • https://gangnampools.com/contents/files/67053303599.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/fede5624fec3cceb51df2aa0e3a8102e/jafederutagafukozid.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_off0000bf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 17556 bytes
SHA-256: df6a74b5d50193b8698fbcdf1327b41ca33af00797ee8cfd0ce84e6f29abdee4
font_02_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 10196 bytes
SHA-256: 0d142d99c14320440bfe4d96a293a2cf43deaaf57318d8f27cdda1ca1232ba3e

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