Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3dd756a391866f7…

MALICIOUS

PDF

87.3 KB Created: 2021-07-08 05:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eab227108e15687b318586310dc781bb SHA-1: ecc6d7ced1d73d188ac929063fae3aa89e1c48a2 SHA-256: e3dd756a391866f777ded4d4c8d8c531dc652b232b036f4b6d837087ede268c5
196 Risk Score

Malware Insights

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

The PDF document contains numerous URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is a social-engineering tactic to trick users into installing malicious software disguised as a browser update or extension. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=sully+full+movie+free+download+with+english+subtitles
    • https://rosycaffe.com/file/87532709443.pdf
    • http://computer-rudolstadt.de/upload/file/32249910793.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4de9bdc5e3---5928714444.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/xalisalokufuviwuziviwomu.pdf
    • https://acgroupenterprise.com/userfiles/file/gujibuber.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798de92495a---mumezadubovunedobulini.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/3efbd4deaf4a01912524bd1bceca9d11/wirixexezafadejebu.pdf
    • http://aggengr.com/uploads/CMS/file/nujixapirotan.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d9926bb178f98dfb5e9c9af912881a7b/15400099315.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d016c614c---wuduvurizupawux.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c7abaa60---84781114257.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c905dd21d6f---vuweravorex.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a364495fb7b---80803631680.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd408655c---99635807151.pdf
    • http://onlinecommerce.bg/uploads/pages/files/67473073529.pdf
    • http://grupposcorcia.it/userfiles/files/jopesujemalurukes.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7322242712---59523861448.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef59bec6f---kinudoti.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/svgl0af5saucrlqdo4qpvn8460/jonezotixoxab.pdf
    • https://rivnerun.club/images/files/losodedikifewitenat.pdf
    • https://accuratesearch.com/userfiles/file/10123783121.pdf
    • http://astro2sphere.com/admin/images/file/vavawusebu.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2756a4cca2129348699753c2d3d8f9ca/28199554589.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f109.bin
9b9087d4b9f2b80043a7a669bd94995361916195ead4335c0b184d56ffcbf654		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 17028 bytes
font_01_sfnt_off00011d5a.bin
d97cf91918baec9bf42e3d3fa5163a9b54831cee8cbd44444cd2cb3c03d471f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 11384 bytes
font_02_sfnt_off000137d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137D6 16792 bytes

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