Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20343454438f7f1…

MALICIOUS

PDF

96.8 KB Created: 2021-07-02 02:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 62333b5ba5accd37577f152459ad3d67 SHA-1: ce5e812b07ef5ca9c14d0dda33970b1a80427812 SHA-256: e20343454438f7f1e8925c43d57ed02cdff46dae1a0c58282f10c51b4104aae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/63e8548520c314037eb592042d393bc8/167543732.pdf In PDF document text
    • http://beta-rc.com/upload/files/20805785402.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/mefoj.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///xawajavisadotozafimi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/3282540062.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608781af54289---10421316964.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ahlejc558h8mb9p8q31i97o3m7/2502360602.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/scoaonn3hutrvcjoum6jtpcq44/rotavuluf.pdfIn PDF document text
    • http://planbmedia.hufiles/piminomitufezosomuliju.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/87567513542.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160749164c3e25---11059172701.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/56530771963.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/4e777e2a6a236c50e63759d4664aa33a/lorolikewetaramajujike.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608783b31a641---woxebosuxukugamu.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074d391c245d---bikojuvadisiwix.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/26166978353.pdfIn PDF document text
    • http://cycling-software.com/files/file/59829106390.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/masekisuxovusaxases.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/tai5ono8egegocfrcr6agr9ujf/dotena.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/61323739089.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc15175991---85046208448.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/40769620195.pdfIn PDF document text
    • https://marosme.ro/hirek/file/pilizadinenenuvoloxekado.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/zuwaxojegon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dissolve+super+glue+from+woodPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16784 bytes
SHA-256: 82ff48906f8f9eb7dfd4633aa4f98d3adaae3bd8ac18760023cfcdf9e4b45836
font_02_sfnt_off00014592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14592 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00015b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B12 10728 bytes
SHA-256: d75f28958210c78bfb1450fe7e035c090e3dd79de117b9a5547d5a75f22cd1c0

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