Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6088225ccb9e4c7…

MALICIOUS

PDF

87.9 KB Created: 2021-06-26 04:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d308e46881e10b81855e74b0bd13b4a9 SHA-1: 69eb77323eb4c15d84b14b2bf7bb0d47275114c2 SHA-256: f6088225ccb9e4c7f1e6a31e6dde13c48a5c4a1cd16ffd12a5023649b48502f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/907af40d2f3b3c7b36eeedd8d7d2357f/70200722832.pdf
    • http://langeline.com/ckeditor/upload/files/18665101663.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/9f6fab6910b64fd2de04be6c4ca537a0/vumotemabavijozaxumuvizuw.pdf
    • https://led7.ru/file/52507776714.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f101dcb682---tovupusitokagobipa.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed573c51df---pobazodegevotutabowezer.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab02fb140e---sexowopiwesida.pdf
    • http://arniestribu.com/campannas/file/45562081253.pdf
    • http://anhbanglaw.com/userfiles/file/8556661993.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/50282550882.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/98a93f33b635a2aa4fc898d9fcd64f68/mojonogagejanuxafawawalis.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/d7e9girmrenaspkis9ut25h5bh/93327716603.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16081c0ba72212---rawetagisikopajevagu.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/3294757620.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/218dae0920b6debb87577adcb617569a/30781180767.pdf
    • https://progin.swiss/ckfinder/userfiles/files/25828686261.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b2d9d574---24522497729.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160763dbd4f276---duraxa.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfabf005a9---97603979.pdf
    • http://csc-021.com/userfiles/file/20210622224824_8wetx5.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c5ea0118d37da0606ec026c9286998d4/70938075686.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/55d36fce3f6cff9c02a4d0630e36d155/mipekojibigit.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160827e015bc33---nevasisadilaz.pdf
    • https://termofriz.rs//files/lunapilezasasagokekasez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mike+tindall+and+prince+william
    • 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_off0000f101.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 16792 bytes
font_01_sfnt_off00010913.bin
3b92619992989a5fe5810612e875237008480bd4f5b4d9adf0c20c4ce1a3d520
pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 18008 bytes
font_02_sfnt_off00013862.bin
cd99538fa8830c92bfd7e3613acb6d2e825ca05586203683c6cb7f1475dad70a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13862 10560 bytes