Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2127c03e586b90…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 12:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f73b9d2cca699742aebddc09ac21819e SHA-1: 46d26feb0f23bfd083b0695f19a2f19e8f91e02a SHA-256: 6c2127c03e586b90f3faf46262f2b225a64176b7b2054118dc67c3817c60d2fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. It functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains. These links are likely intended to lead users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=best+reptile+pets+for+kids PDF link annotation
    • http://eltonltd.ru/sites/default/files/uploads/90304120902.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc5c29e7a---2399967630.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062618135651.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/mabinilezudixif.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/019473356265095d0e1c381471c4c3a1/felurovufoxutoji.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/b70f32da4701b1d7607770eec57d2c39/soxowudigikige.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vn2743g9img9uid8heeogf93p9/61178249992.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/90560928512.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/sakavusu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e1f77cf22edb3c1f1ac01df30e2daf02/bepoxujevuratujaxudobis.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/komogapiwase.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086648e8a870---sinubirel.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/44639616036.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/fegubonepevovabojupagina.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/32476779904.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/9461844815.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/31afb2c8507a99167454e3d3ef0d70ca/mosavesesirufexunojux.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/bumirewis.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3adc372d4e97f3f92c0e92499c873680/mirisawozadenuses.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/386a30d5e32b7c8c0fd03314af3572a4/79061750044.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c6a7d8e2ea92b9b5627037af1ab310e9/98407109442.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/jelubifewulezarexok.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611965e14c410---ziranokinivavununuvetafo.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/280480932.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_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 10372 bytes
SHA-256: a1da3165d9ca457bb54ed6fe142013200943d908322cce0168a6f949575751e2
font_01_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 16740 bytes
SHA-256: 21d6cfd31b356e0b0cb28c36ca7287f80f0a06737c1ff3891efa3aa0792a2ff7
font_02_sfnt_off00013394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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