Malicious PDF — malware analysis report

Static analysis result for SHA-256 296cf8170326e7f6…

MALICIOUS

PDF

96.2 KB Created: 2021-07-02 15:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c33f8dff86755fac1c81e45158499258 SHA-1: 75cfec42a18e8cdd78a0ffc31cf040c70511b5cc SHA-256: 296cf8170326e7f6d2d3f2dd04a8003e8d941b7ac1d838e964d60616ac71c3cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is a primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cructi.ru/uplcv?utm_term=conjunction+exercise+for+class+7+with+answers PDF link annotation
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/24face5b67552a697d4c595d7f863110/noponuzoxuram.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/76979299140.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/96447225087.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa3e340b6---puson.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210528_8268820C68DBAC22.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bf08deeef---gakazopojekogolo.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/89586062806.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8001f53dff---noxukaxamusisanun.pdfIn PDF document text
    • https://menu2uplus.com/images/file/5997728034.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6ce5e61979fc8f250c462a923cea8a12/49183942118.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa6beb9db---28863277205.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c63dd4cb89f---kowuna.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/90388f07a242d8949c38d44c6d62e30a/jotovu.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/livivunowol.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/xadanapapevar.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/62188744874.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/dinixopelekal.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d3877dcb681bff453c1d9a698e45f99d/xizetupudoxosabakukimaj.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f5fe4f68---1382882700.pdfIn PDF document text
    • http://scantech3d.com/files/janejiwujotirav.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/4510681868.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/vudaxuzasanupuziwe.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a863b9c5---zawizebo.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1eb95c3568b582325cc4a29137cc4353/masuforebumakurogimixob.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 17024 bytes
SHA-256: f957e0b8c496654bdad9ceba3e2ef047d09f1cb38667b2b55ae62d7d1f9a4471
font_01_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off00014183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001599a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599A 10932 bytes
SHA-256: bf06f05bdca20d6317f679dd0816561601be79221f66b224799ffb709b6e9455

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