Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ab864b04e0d896…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 09:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1446e65c208fd664a169ede02fd5402 SHA-1: e9a5a67334cb64eb08ac768d08332cf93ab2a0d3 SHA-256: 28ab864b04e0d8967ce5193065aec6a9f9288d9134d43f0b2b484094a9ccd4d1
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing malicious software by posing as a necessary update or plugin. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, likely serve as download locations for further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=mp4+to+avchd+converter
    • http://agataklimowska.pl/userfiles/file/96868281797.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb5d42e86---83168273022.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/044ff3d14ed50ee978301452f82fbfdd/37936162427.pdf
    • https://asset-books.com/userfiles/file/46316770195.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlpcrofi4m96oqkqba0lr99plq/79482657411.pdf
    • https://appfacile.it/file/digupejefufebexafosesim.pdf
    • http://dok-vo.ru/userfiles/file/11248647977.pdf
    • http://anhbanglaw.com/userfiles/file/bogevuwezalojawe.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e39bf050---vososog.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1853cc69f1---85143894615.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f6af6f59a---31210458923.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ddaea6f8d---nozusakufujikudi.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/a81g7lkl0pd5b71be3643utrsb/fusowijiziduguvumatuxe.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac330964857---36048096398.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc6169392---vinakabolekiz.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160852dcb17724---93476525545.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/winirozip.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608743f76cc1e---wimibizemi.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160773d52bfd7f---16925563825.pdf
    • http://benevolo.it/userfiles/files/xapilekujabudazeranom.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ed1d82842c1851e31d94d38b40e2933f/503629958.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b55d09f71074e9c8bfc5da86c3e09aab/wixujikibe.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2c7d66f3---lonawusagopujexugur.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/tizesutulufowononugi.pdf
    • http://moscowprice.com/content/xuploadimages/file/47420358954.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac1d76e635---tuketatigereremikabuvuxo.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_off0000f392.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 16792 bytes
font_01_sfnt_off00010ba4.bin
baa9776487e61542494f73e080ee97dde745d66e623eadd287d8614c14a4a6c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 16896 bytes
font_02_sfnt_off000137ee.bin
7a7c25d115b0ba5fada1d77b5722a1edb62a9a53e7628f91b34d398064eaebe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137EE 10440 bytes

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