Malicious PDF — malware analysis report

Static analysis result for SHA-256 38057f4959c54a6f…

MALICIOUS

PDF

94.5 KB Created: 2021-08-03 03:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d282358d14372b05037f2f31888295ca SHA-1: 911bd7298e482607a53650838205060495fe704d SHA-256: 38057f4959c54a6f1fbf17cfcb4da1afe2eca528e3dda1cb0a6e8f8c634baddc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to redirect users to malicious sites or for SEO poisoning. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 6

  • 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://machi-tomo.xyz/js/ckfinder/userfiles/files/tagazelafi.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/958su0p83s01beorq5eogl1tu3/vavapozukapikix.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/d2pqmmk10fitkf2ul6ttap2k64/66470927282.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b3ce9119660bcd1ab99c20dc2097b03c/23072951691.pdf
    • http://bitite.lv/media/txt/122/file/42943408374.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3710d12ba---98876848446.pdf
    • http://argyleliquidations.com/userfiles/files/67874307593.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/654c8c2209cefe9c64e3ecb63aabaab0/vetemam.pdf
    • http://auldskoolrocks.com/clients/878384/File/fewifidatoz.pdf
    • http://kbchina.de/upload/60359796029.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608426577df5b---vudis.pdf
    • http://asbufestival.com/uploads/FCK_files/file/83228157055.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/31de7003c5d928a3a6fb7dd9b8eedf6e/lodolufakexed.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/55bd757760cf11391d541095bb0eb810/49592835744.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/umvk0p1ou8rrqmevotlpv0rbpu/zuvoxoxasufusanuxedig.pdf
    • https://esz.jp/img/editor/files/33667936159.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/633f33c6d48cc32d18b2c54e02b805b2/kilovovizipival.pdf
    • http://jongauger.com/userfiles/file/43932950133.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa016ac408e---gumemimapetebe.pdf
    • http://costruzionibulagna.it/userfiles/files/nenatugebolutox.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83417340c2---81068871454.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/52475167851.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/dawisibopu.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8db87f79daee0c906e9dd3d22bba0eda/mabigelazelagenomosoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=travel+spend+premium+apk
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db24.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 16092 bytes
font_01_sfnt_off0000f065.bin
5ca6aebd3e020b0638c79c117e67ee1558a2a140c63700b236d11e145169ff87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 18404 bytes
font_02_sfnt_off00012170.bin
1ebc5aef086544f15534236afcf9d3bff8758561434b0d145bfe1e196f0f453b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 10556 bytes
font_03_sfnt_off0001396e.bin
4c6e63ae558bcb6e761ad0f48b37f33954ee86896d98ce3c02f69ce61623c08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1396E 7348 bytes
font_04_sfnt_off0001534d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1534D 16792 bytes

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