Malicious PDF — malware analysis report

Static analysis result for SHA-256 9786db9281e0da12…

MALICIOUS

PDF

91.4 KB Created: 2021-08-05 21:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 891f8ac9a583b70d8d5f2a7dad152564 SHA-1: 2fcccdbb08d06eb11f809f6243022408130ccfa3 SHA-256: 9786db9281e0da12e08b76826ebf81592c0229d82e7ecb68560a48b044ac9fdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=subnautica+do+resources+respawn
    • http://bensonlandscape.com/editorData/file/jomenow.pdf
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/kasigajuzil.pdf
    • http://vencedor.coop/images/admin/file/67018770282.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917a48760be---10989087718.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/q9a3dkotkmibu07tii7ou7p003/sarowotodulemup.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb79ed8d6---libegulikod.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/sekumizevox.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfea4485ef---50061096209.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160802cf2afce0---75590384128.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f2cb2179b8a---rosixisifuvexevabaj.pdf
    • http://dj-maily.com/uploads/pages/files/faxakuke.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14dcec7d67564f2b50aedb51df125af8/14060731788.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8cd0f88e3f97def68a469630502e06a3/muwetutavexobunaderitari.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c1d984e87ae1ef292e41fb5b4620a18/pufokagak.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3868b8344c---dulovavipanoniduvaxof.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b9e2800f1b92f2472ef3280837223062/morenaxodiruvasuvanarokor.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/39359273d95022cd8fd5ad7bf76dd716/60253038689.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/4f7c8559be2d5e945f25d3792603c4e2/dekosuzelelijirebebus.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaed76cd3f---3178373321.pdf
    • https://pharmnet.cz/ckfiles/files/files/tibavafoxov.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2c23164d294c1a6f0d23d955ef33819a/jevuxuvedalisi.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e67889d355d7dd827e4f7fde0d68eee5/51936151164.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d28472487d5---75149073314.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_off00010147.bin
415dca60a0fd98a1767f8f02e15b2d71e684aab31cb63323dfc2dd2155eaec55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 10860 bytes
font_01_sfnt_off00011a5b.bin
4eb5e8f33ff41c8686bc0e82d3333de9bea4ddc92b9d8fe2313c75dc56967cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 17516 bytes
font_02_sfnt_off000147cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147CD 16792 bytes

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