Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bf56e73ecbd1f6…

MALICIOUS

PDF

121.4 KB Created: 2021-06-26 01:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d40762fed2795dc1e032943f3a81518 SHA-1: af92350b6df274e456e503ce1ebb5ba241e92bc1 SHA-256: c1bf56e73ecbd1f64c946ef9e59353587c1f2a58e7b3cc27e60dd22113a74c18
244 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external resources, some hosted on compromised WordPress sites. Heuristics indicate a lure for remote support tools and password-protected archives, suggesting an attempt to trick the user into downloading and executing a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ghioroiu.ro/sites/default/files/file/xodawesenoka.pdf
    • http://flygarfield.net/userfiles/file/guguwojorikedirakivaxeni.pdf
    • https://sportsht.com/userfiles/file/ravugefogime.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/fakujitib.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/71bghv2arubh8pigkmq077ukl5/67662669810.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad85cea6f78---64255415433.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/55ab703aab6cd7b2e02834a2564de4af/54110184954.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4038fb17---xunirozusidoduzuvowivev.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073591dc5263---5302351425.pdf
    • http://kstarsmall.net/userfiles/file///bumivot.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/73008768442.pdf
    • https://hohsingfiber.com/ufiles/files/75039757683.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3431895c26---dedejis.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c732fa4945---lunapojudirikavexowuj.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/56c20f22e6d4f0ccb45c7f740692380c/97783643268.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/400fbbc0ead7f9da45608b6bbe5faa80/59705828858.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/da7d2467837cdd6f7e013980e730dc4b/tuvodugipute.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfbdc1609f---51159816460.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ca0df9d5---25421597435.pdf
    • http://staractivecollection.com/resimler/site/files/nuvulejajapugazegot.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083950012226---wuteziza.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe6603bd4---92910826821.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae4247de7---73733403869.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/toxisifi.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160814f965719b---tusutomirifude.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=samsung+tool+pro+35.3+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001a6b4.bin
404b4c11c588bc47526df3b3ff4e513ebd284c5057a8b7711e0f704eda25fb8d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A6B4 26332 bytes
font_00_sfnt_off0001447d.bin
03da799c13d025b27ba964f24344df2a009205def4f36dfa0c0ffbed0e29b876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1447D 18688 bytes
font_01_sfnt_off000174bf.bin
08056626d02de821d6db2025446e54e75b5403f89db3a812923bfa4728f852f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174BF 11144 bytes
font_02_sfnt_off00018ea3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA3 16792 bytes

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