Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9f76615f7a46db…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 16:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 682adbcc5ae849ad7d6fad5224f4d1a8 SHA-1: 012b410eba9bd25d00f3b01c942eaf168c5d58fc SHA-256: 5a9f76615f7a46dbde2658f7caa341d62ee02198261724e01872986a7fc33bcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The primary function appears to be a link farm designed to leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://webvitamin.vn/app/webroot/uploads/files/98104280980.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a45d3e16e---lepubolunaguji.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210823233823.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/a8qn9j0usveqrabdv5dcc0n9o0/dedezatutuzagu.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/puzererosuxuzikikegopejin.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/44104637116.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/tawusifabakalokuzi.pdfIn PDF document text
    • https://hgb.se/filer/file/8440245319.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19039b96a---kavofozi.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c331cbd6654cf93a0f6a75f13dec485a/jawagakisubibevuzila.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/37b5c36e82082bd88e853b35fc530815/nusumadapuxu.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/002d5cbc2efdeff435e25c5d9a6dfce7/gupuluranovarudu.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/fonedogedupofusakig.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/25219984002.pdfIn PDF document text
    • http://konberdbio.com/upload/files/muxosasaxiro.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b00302e88c2---10334200789.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/44559443634.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ff7bf296ca28a640607fb1041288ae0b/rawebewegazimorivetu.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/tegedijukunewojub.pdfIn PDF document text
    • https://rcot.org/userfiles/file/loxaxabolobovoba.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075937d80fbc---82491295029.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788ea23e735---84171594946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=blue+prism+rpa+tutorial+pdfPDF link annotation
    • 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_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 10708 bytes
SHA-256: 1885c10f0c253b44c986d48cdef66fa4759fed790850d117ddfb566a1579ce98
font_02_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 17960 bytes
SHA-256: 2af43c82ae0fa7b08c1b5571bbaf99e83efc4169f012001a525b0e3bdd6761cb

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