Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd15c8acf5c98e4c…

MALICIOUS

PDF

91.9 KB Created: 2021-09-22 18:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d9addaa4f34b0aeefcb94c72ad2cb44 SHA-1: fbbc0d9bfdadf450f6b843cb2795c2f84abf3654 SHA-256: dd15c8acf5c98e4cff4c7bf64790a00a6517d7d2f9313624c3ecfe15a9e5f936
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=happy+words+beginning+with+p PDF link annotation
    • http://currycornersugarland.com/admin/images/file/56993345382.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/70369830489.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37e1e09b9d0d9909df23f5eb719dcdb0/wewuxuve.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/fbc9f25bfe045c33762a81100905be6f/lewelin.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/wufitawapobez.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fd1bf71c2168931d03d6df9145821402/92474728104.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/lalorivizuzimeziwidopore.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/texamegazupenunaterisufon.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/1126715617.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59b8a4698---sitov.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/tuvutifesetagezotanakilod.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/30845103957.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/zimasexekofaf.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cad324ad4ffb26f774a2fc2fb6e27219/25429468502.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/82044560868.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/87kt6ulo5fm23j5njff6rf7rt5/69059332499.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4cc005d97206a76d73ff342bd07eab66/43380627571.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/zubezaregale.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/22522834713.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/gevepaparejikamod.pdfIn PDF document text
    • https://porfic.com/fotos/file/tuwovijudebikutekugorujo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2100e5f4---fumomedafavub.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kipufimupal.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_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 17792 bytes
SHA-256: 1176032aec45dceb671303f2f7996ca03bab3e57c26e8d9d89528dd86ad61020
font_01_sfnt_off000130fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FE 10956 bytes
SHA-256: 1d174fdd7c9e16f4ea827432db161742ffebd81f79973fd1a79e4490ca24e3c0
font_02_sfnt_off000149f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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