Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4df2ad8b5d29531…

MALICIOUS

PDF

94.7 KB Created: 2021-09-05 15:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9f75622e2502c9835b6e32664f9c822 SHA-1: 3ed306a7b743a8bdd344f6dfe71d5d5268aeb916 SHA-256: f4df2ad8b5d29531a5124f2472c988f1c390bdbb425c1629881ac15e9e89923a
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs pointing to various websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=jozef+mak+pdf+kniha PDF link annotation
    • http://budoprojekt.eu/obrazy/file/patuvab.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/lidekevafalitekila.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/64295925839.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f562c5dec3---difexodapiwazisojesezi.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/63752946544.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/cc90f9e315f64352b6fd3607c2d4e424/wibalitada.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8f72c20be---malusegejiwo.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1b82839dc---genozibub.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/lamatuxekakep.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/97516304241.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/leximijudepuk.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61845a4c91---rudalor.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/21407074876.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/sefodixoxaputunosowadaja.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4b25142b1---42337172128.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daa76fddecd---zanasixe.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e16fdbccb---80948438186.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d46cc46c---ragif.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/silifi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e922b4a26f---1402594405.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/917a65fc3e58b10957a1177d2e1ccaa1/wupazinu.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210612_047BBB43BE16B774.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161147557d2ef4---pokopufevimedefek.pdfIn PDF document text
    • https://fallsplat.se/file/xisixuf.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/62104407572.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 21868 bytes
SHA-256: d13872c92c99605d29ceb152872a2b528f003f9796708735e99c7510548b6a6d
font_02_sfnt_off0001553c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553C 10492 bytes
SHA-256: af61b0e5267bdbe10ada7e9e04e064896b15a7f31a320d37251878b78cc36294

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