Malicious PDF — malware analysis report

Static analysis result for SHA-256 239f6c41092e9aef…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 16:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ea6e9506fad731e9ab060a190715730 SHA-1: 116c2e854b5a41f9c36a745e953c57ea02639a7c SHA-256: 239f6c41092e9aef957964f87ff50dabf88513ff6de2ce53a8ba5a9e9d5793e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=generac+homelink+pre+wired+manual+transfer+switch+kit PDF link annotation
    • https://imahima.xyz/js/ckfinder/userfiles/files/dumumezopodesirubarupu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1932e455d---20520962488.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/15472271249.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/64251241033.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/jemaruwovoxuxelutikaz.pdfIn PDF document text
    • http://screen.by/images/file/gonukarulagivi.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/zolenomofogugijawasinaw.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/ja04uos13e0likpdsa8dh9p5qa/zorivupuminenetavozi.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0e73bccd---21288732145.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/dorajisux.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/desijaxufibenesulaz.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/najutaj.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///vezojezadatituleb.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/05f4d8756080f2d4a8068ea9061cab37/zisoxetuvanubutu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60128321e---botidu.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/57409154456.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/kabasurigusofijifaza.pdfIn PDF document text
    • http://rts-3.ru/upload/files/ratonoridozivodur.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/rarulanebiduneroxanaduba.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/27569931523.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/20154368022.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d64c675e6546366288c1f5f256fc489e/39068782.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/74076620886.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/28800506917.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_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 18924 bytes
SHA-256: 5674754d2c658d265f28de385000e9e8424da517188c576c3f687f34ded7eed3
font_01_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 11200 bytes
SHA-256: 079075f0c58cb6acedd315c2e7a7b6699a33cca20b9538301fd33167fb0b6b70

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