Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6a95184f7cc937…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 23:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5de6c93639a26692670aef7a0a67362 SHA-1: 52b0872ee4601ab77880d15219e58412116629e3 SHA-256: ec6a95184f7cc9372ff47eff115fb07d50413230f844dd8b534ba5ca5b77f574
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to compromised WordPress uploads and other external URLs suggests an attempt to lure victims to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d44102f32---95545050998.pdf In PDF document text
    • http://srilakshmienterprises.net/uploads/gipidanunumujelix.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/46179620312.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/61c45c9ed97b0aa2ae500ef8fe4025bb/mimebewojorulidab.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/suruzipaletogimolukivi.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/pitopakifojuzakezikaj.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/dugefikemabavuvor.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f8693a99---11649237058.pdfIn PDF document text
    • https://patc.fr/imagesfile/mogewuwidijajubo.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/leserazibasepamejikixonov.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/73620238375.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/11430299638.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/uadic2mnd6bu31m1kgs4iba6l0/nojun.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161370c217676c---mexagidefo.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/90950915140.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/guviwexinesosokagivugikup.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/68179740722.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/93059743326.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/55677153104.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75257383741.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zulirirore.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/29978177922.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/50849229918.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/xevisixaw.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/87822622067.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/17990844515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=numerical+double+integration+trapezoidal+rulePDF 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_off0000cc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC92 10964 bytes
SHA-256: 21515c055cebb71bcb7e1e61a5f3184c31901dda4cb1e507d28260b28409cfcf
font_01_sfnt_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 18448 bytes
SHA-256: 00f93f4a9f448d5feee9aa439b5c174a00d7cd1b2984c1d383f907f2a9963e23
font_02_sfnt_off0001165a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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