Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d4e398d4350214…

MALICIOUS

PDF

79.9 KB Created: 2021-07-24 13:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27985aeb5dd68bfa8d8576d7a947b814 SHA-1: a77c6899b8483bb3726f18c2d972748e5da3e489 SHA-256: 09d4e398d43502149889189af4ba2dd767a0461c621c9ad57fb23cd7bf1a116f
156 Risk Score

Malware Insights

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

This PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e120884b1bf---92845718423.pdf
    • http://aarogyamedico.com/userfiles/file/nasojevuk.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e7c304f48---xuraxegowesugisijabop.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5a7a4cf1752d8153be5fc7a3955e962b/letinixo.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/9nefdcea7cefjib9d15vvumnu6/ratizowot.pdf
    • http://klpa.net/userData/board/file/jezikaze.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b3ce9119660bcd1ab99c20dc2097b03c/23072951691.pdf
    • http://zafirkort.com/uploads/files/zafuz.pdf
    • http://chinasoftcore.com/userfiles/file///2393260768.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/84712107324.pdf
    • http://austria-ex.com/images/blog//file/gozuvutamoseg.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/75248226613.pdf
    • http://linkipt.com/_UploadEditor/files/tubobutokodid.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/18559066210.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7ac03f15---bimoxewasa.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3446fdeeb4c4c9cced8bd1c259a973b6/98263418604.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ccd5860d73ec3ebc5abb673ebeea18c6/morasamokejirajix.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/jmiup7p3gqvg3896unklap3u5c/6424177014.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c17bfbe3a3a---gorupagavirejabedozef.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/61553b4ea58ee52027f0bdaaa2809324/dewezosamefabi.pdf
    • https://aimhc.com/userfiles/file/vopefuridudazuxijukaxezij.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5tqu3dtakflqeqpn6v4he6n1r6/tagosinaku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+install+hp+ink+cartridge+910
    • 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_off0000d334.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 16792 bytes
font_01_sfnt_off0000eb4b.bin
2859ab6544c9ab1d8e7ea4c3cd41e01a14ebaf7999cab3aba4aa6ce0fd3c21fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 11304 bytes
font_02_sfnt_off000105a5.bin
9e6954ca909e3412e7f1062f3d9cfca63877e03bc6a4dc0a7d073db6c36c7027
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 16748 bytes