Malicious PDF — malware analysis report

Static analysis result for SHA-256 b775c6a94f1af4a6…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 03:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9792dd9f385e63cdfb3e8d5dcf1a2bea SHA-1: dd2929039b8d40d4026e5edb3fcaab465b541517 SHA-256: b775c6a94f1af4a6c0b5a3365074adad908ae46fa1db4b102ac12359d9e78a2d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=where+is+cast+option+in+mi+tv PDF link annotation
    • https://togelunited4d.com/contents/files/kowofofixazipim.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/93286799698.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/fovubedabuwipepaje.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/ropimuretidajosubo.pdfIn PDF document text
    • http://ihdbd.org/upload/files/66090314451.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/1611226346.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/77416830321.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/10142903216.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/96lae28d7hgopdcg0fp76sq16e/kaboro.pdfIn PDF document text
    • http://e-sheremet.com/img/26424915724.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/360ce3a3d5cc39cfcc9ef3ed05bfa0cf/69337002053.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/6296414706.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/juvipozuz.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/paxujobewuzodofon.pdfIn PDF document text
    • http://surausa.com/uploads/files/2154521016.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/sefizumezuwumufuvagi.pdfIn PDF document text
    • http://dalaichau.com/files/bisorevubefujagapova.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ng6kf51tlqq381sgelsmseggel/pomimifapevobolojen.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/tutifez.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee48e306b---62861770778.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/jasoxafiniximutaweru.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_off0000d31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31F 10652 bytes
SHA-256: b90c2173d65769b935d870f436c6ae84b986e7b2c3ec7116a3585920f982216e
font_01_sfnt_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 16164 bytes
SHA-256: e08c3f2ffa8e5f2996548a8b6198dfabe6484645be79f5205c375e63fbf336b9